Add CROSS_COMPILE support to wearables

wearables uses prebuilts- 'arm-linux-androideabi-'

Change-Id: Iffcd3b8746fda1e41f6eb35f6ab01d5c8a85f278
diff --git a/AndroidBoot.mk b/AndroidBoot.mk
index dbe8a92..104f4de 100644
--- a/AndroidBoot.mk
+++ b/AndroidBoot.mk
@@ -7,8 +7,12 @@
 CROSS_COMPILE := ../../../prebuilts/gcc/linux-x86/arm/arm-eabi-$(2ND_TARGET_GCC_VERSION)/bin/arm-eabi-
 endif
 else # BOOTLOADER_GCC_VERSION defined
+ifeq ($(BOOTLOADER_GCC_VERSION),arm-linux-androideabi-4.9)
+CROSS_COMPILE := ../../../prebuilts/gcc/linux-x86/arm/$(BOOTLOADER_GCC_VERSION)/bin/arm-linux-androideabi-
+else
 CROSS_COMPILE := ../../../prebuilts/gcc/linux-x86/arm/$(BOOTLOADER_GCC_VERSION)/bin/arm-eabi-
 endif
+endif
 
 # Set flags if we need to include security libs
 ifeq ($(TARGET_BOOTIMG_SIGNED),true)