android: remove LOCAL_MODULE_TAGS := optional tag

Seems to be the default option since ~2009 with commit 2f31293ba78 "auto
import from //branches/cupcake/...@137197". Fleshed out from a larger
commit in the AOSP repo/fork.

Cc: Dan Willemsen <dwillemsen@google.com>
Cc: Chih-Wei Huang <cwhuang@android-x86.org>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Android.mk b/Android.mk
index 2aa2bc9..6ecc4e1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -30,7 +30,6 @@
 #static library for the device (recovery)
 include $(CLEAR_VARS)
 LOCAL_MODULE := libdrm
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SRC_FILES := $(patsubst %.h, , $(LIBDRM_FILES))
 LOCAL_EXPORT_C_INCLUDE_DIRS := \
@@ -48,7 +47,6 @@
 # Shared library for the device
 include $(CLEAR_VARS)
 LOCAL_MODULE := libdrm
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SRC_FILES := $(patsubst %.h, , $(LIBDRM_FILES))
 LOCAL_EXPORT_C_INCLUDE_DIRS := \
diff --git a/amdgpu/Android.mk b/amdgpu/Android.mk
index 57c53a7..332d957 100644
--- a/amdgpu/Android.mk
+++ b/amdgpu/Android.mk
@@ -5,7 +5,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_amdgpu
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm
 
diff --git a/etnaviv/Android.mk b/etnaviv/Android.mk
index a3a2295..a70eeac 100644
--- a/etnaviv/Android.mk
+++ b/etnaviv/Android.mk
@@ -5,7 +5,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_etnaviv
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm
 
diff --git a/freedreno/Android.mk b/freedreno/Android.mk
index fba48f2..d7e80e1 100644
--- a/freedreno/Android.mk
+++ b/freedreno/Android.mk
@@ -5,7 +5,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_freedreno
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm
 
diff --git a/intel/Android.mk b/intel/Android.mk
index 838a93b..e7ec5a5 100644
--- a/intel/Android.mk
+++ b/intel/Android.mk
@@ -28,7 +28,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_intel
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SRC_FILES := $(patsubst %.h, , $(LIBDRM_INTEL_FILES))
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
diff --git a/libkms/Android.mk b/libkms/Android.mk
index cf0e9bb..0259ffb 100644
--- a/libkms/Android.mk
+++ b/libkms/Android.mk
@@ -45,7 +45,6 @@
 endif
 
 LOCAL_MODULE := libkms
-LOCAL_MODULE_TAGS := optional
 LOCAL_SHARED_LIBRARIES := libdrm
 
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
diff --git a/nouveau/Android.mk b/nouveau/Android.mk
index b67d30f..451f9a7 100644
--- a/nouveau/Android.mk
+++ b/nouveau/Android.mk
@@ -5,7 +5,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_nouveau
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm
 
diff --git a/radeon/Android.mk b/radeon/Android.mk
index e704443..57cbc92 100644
--- a/radeon/Android.mk
+++ b/radeon/Android.mk
@@ -5,7 +5,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_radeon
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm
 
diff --git a/tests/util/Android.mk b/tests/util/Android.mk
index 1bd82ae..c9d087e 100644
--- a/tests/util/Android.mk
+++ b/tests/util/Android.mk
@@ -27,7 +27,6 @@
 include $(LOCAL_PATH)/Makefile.sources
 
 LOCAL_MODULE := libdrm_util
-LOCAL_MODULE_TAGS := optional
 
 LOCAL_SHARED_LIBRARIES := libdrm