ANDROID: build: fix build config kernel_dir

Change-Id: I88b87a9c85990b12dc8174349cfc14eddfb379d2
diff --git a/build.config.goldfish.arm64 b/build.config.goldfish.arm64
index 0b4c406..9c963cf 100644
--- a/build.config.goldfish.arm64
+++ b/build.config.goldfish.arm64
@@ -3,7 +3,7 @@
 CROSS_COMPILE=aarch64-linux-android-
 DEFCONFIG=ranchu64_defconfig
 EXTRA_CMDS=''
-KERNEL_DIR=goldfish
+KERNEL_DIR=common
 LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin
 FILES="
 arch/arm64/boot/Image