Fix package path of android/soong/android pctx

android/soong/common was renamed to android/soong/android long
ago, but the pctx package path was still "android/soong/common".
This required all users of rules defined in android/soong/android
to import "android/soong/android" and then
pctx.Import("android/soong/common").

Test: m checkbuild
Change-Id: I20d096522760538f7cfc2bec3d4bfeba99b275d4
diff --git a/android/defs.go b/android/defs.go
index cd8b4e3..4890c66 100644
--- a/android/defs.go
+++ b/android/defs.go
@@ -20,7 +20,7 @@
 )
 
 var (
-	pctx = NewPackageContext("android/soong/common")
+	pctx = NewPackageContext("android/soong/android")
 
 	cpPreserveSymlinks = pctx.VariableConfigMethod("cpPreserveSymlinks",
 		Config.CpPreserveSymlinksFlags)