Rename common to android

Rename the "common" package to "android", because common is too
generic.  Also removes all android.Android naming stutter.

Ran:
gomvpkg -from 'android/soong/common' -to 'android/soong/android'
gorename -from '"android/soong/android".AndroidModuleContext' -to 'ModuleContext'
gorename -from '"android/soong/android".AndroidBaseContext' -to 'BaseContext'
gorename -from '"android/soong/android".AndroidModuleBase' -to 'ModuleBase'
gorename -from '"android/soong/android".AndroidBottomUpMutatorContext' -to 'BottomUpMutatorContext'
gorename -from '"android/soong/android".AndroidTopDownMutatorContext' -to 'TopDownMutatorContext'
gorename -from '"android/soong/android".AndroidModule' -to 'Module'

Change-Id: I3b23590b8ce7c8a1ea1139411d84a53163288da7
diff --git a/cc/arm64_device.go b/cc/arm64_device.go
index 8ee2bc4..dcdce0f 100644
--- a/cc/arm64_device.go
+++ b/cc/arm64_device.go
@@ -18,7 +18,7 @@
 	"fmt"
 	"strings"
 
-	"android/soong/common"
+	"android/soong/android"
 )
 
 var (
@@ -195,7 +195,7 @@
 	return "libclang_rt.asan-aarch64-android.so"
 }
 
-func arm64ToolchainFactory(arch common.Arch) Toolchain {
+func arm64ToolchainFactory(arch android.Arch) Toolchain {
 	if arch.ArchVariant != "armv8-a" {
 		panic(fmt.Sprintf("Unknown ARM architecture version: %q", arch.ArchVariant))
 	}
@@ -207,5 +207,5 @@
 }
 
 func init() {
-	registerDeviceToolchainFactory(common.Arm64, arm64ToolchainFactory)
+	registerDeviceToolchainFactory(android.Arm64, arm64ToolchainFactory)
 }