Remove grouper/manta/mako.

They are unsupported in MNC.

Bug: 19548232
Change-Id: I86f492a38f554882e1f5ea16f240dcd60fcb3439
diff --git a/main/Android.mk b/main/Android.mk
index d565e64..c365054 100644
--- a/main/Android.mk
+++ b/main/Android.mk
@@ -79,14 +79,6 @@
 ifeq (,$(filter $(TARGET_ARCH),arm arm64))
 tool_ldflags := -static -Wl,--build-id=none,-Ttext=0x38000000 -nodefaultlibs -nostartfiles -Wl,-e,_start
 # ioctl/syscall wrappers are device dependent
-ifeq ($(TARGET_BOOTLOADER_BOARD_NAME),manta)
-ANDROID_HARDWARE := ANDROID_HARDWARE_nexus_10
-else ifeq ($(TARGET_BOOTLOADER_BOARD_NAME),grouper)
-ANDROID_HARDWARE := ANDROID_HARDWARE_nexus_7
-else ifeq ($(TARGET_BOOTLOADER_BOARD_NAME),MAKO)
-ANDROID_HARDWARE := ANDROID_HARDWARE_nexus_4
-endif
-
 else
 tool_ldflags := -static -Wl,-Ttext=0x38000000 -nodefaultlibs -nostartfiles -Wl,-e,_start
 endif