Android: simplify BUSYBOX_CROSS_COMPILER_PREFIX

The original definition is complicated and won't work
if not build from a lunch environment.

The simplified definition should work for all archs
in all situations.

Change-Id: I961c46942b80e516bc89d41afe6e0fa28611e8de
Signed-off-by: bmc08gt <brandon.mcansh@gmail.com>
diff --git a/Android.mk b/Android.mk
index a6f4f2a..1136543 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,16 +31,7 @@
 LOCAL_PATH := $(BB_PATH)
 include $(CLEAR_VARS)
 
-# Explicitly set an architecture specific CONFIG_CROSS_COMPILER_PREFIX
-ifneq ($(filter arm arm64,$(TARGET_ARCH)),)
-    BUSYBOX_CROSS_COMPILER_PREFIX := arm-linux-androideabi-
-endif
-ifneq ($(filter x86 x86_64,$(TARGET_ARCH)),)
-    BUSYBOX_CROSS_COMPILER_PREFIX := $(if $(filter x86_64,$(HOST_ARCH)),x86_64,i686)-linux-android-
-endif
-ifeq ($(TARGET_ARCH),mips)
-    BUSYBOX_CROSS_COMPILER_PREFIX := mipsel-linux-android-
-endif
+BUSYBOX_CROSS_COMPILER_PREFIX := $(abspath $(TARGET_TOOLS_PREFIX))
 
 BB_PREPARE_FLAGS:=
 ifeq ($(HOST_OS),darwin)