Replace ModuleContext.AConfig() with Config()

AConfig() now duplicates Config().  Replace the uses of AConfig()
with Config().  Leave AConfig() for now until code in other
projects is cleaned up.

Test: m checkbuild
Change-Id: Ic88be643049d21dba45dbd1a65588ed94bf43bdc
diff --git a/android/hooks.go b/android/hooks.go
index a9bfd33..57560d2 100644
--- a/android/hooks.go
+++ b/android/hooks.go
@@ -26,7 +26,7 @@
 // before the module has been split into architecture variants, and before defaults modules have
 // been applied.
 type LoadHookContext interface {
-	// TODO: a new context that includes AConfig() but not Target(), etc.?
+	// TODO: a new context that includes Config() but not Target(), etc.?
 	BaseContext
 	AppendProperties(...interface{})
 	PrependProperties(...interface{})