Remove required dependency for non-existant module

libmixvbp doesn't exist in our source tree.

full_fugu/std.log:1013:build/make/core/main.mk:592: warning: Missing required dependency libmixvbp from module libva_videodecoder defined in hardware/intel/common/libmix/videodecoder/Android.mk
aosp_fugu/std.log:1013:build/make/core/main.mk:592: warning: Missing required dependency libmixvbp from module libva_videodecoder defined in hardware/intel/common/libmix/videodecoder/Android.mk

Bug: 7456955
Test: above error no longer visible
Change-Id: I536a0e7e20e0ea4a681ebea94399c433363136dd
diff --git a/videodecoder/Android.mk b/videodecoder/Android.mk
index 7f6d386..1600bef 100644
--- a/videodecoder/Android.mk
+++ b/videodecoder/Android.mk
@@ -76,7 +76,6 @@
 LOCAL_CFLAGS += -Werror
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := libva_videodecoder
-LOCAL_REQUIRED_MODULES :=libmixvbp
 
 ifeq ($(USE_HW_VP8),true)
 LOCAL_SRC_FILES += VideoDecoderVP8.cpp