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/cc/binary.go b/cc/binary.go
index 5f81866..206237a 100644
--- a/cc/binary.go
+++ b/cc/binary.go
@@ -182,7 +182,7 @@
 
 	if !ctx.toolchain().Bionic() {
 		if ctx.Os() == android.Linux {
-			if binary.Properties.Static_executable == nil && Bool(ctx.AConfig().ProductVariables.HostStaticBinaries) {
+			if binary.Properties.Static_executable == nil && Bool(ctx.Config().ProductVariables.HostStaticBinaries) {
 				binary.Properties.Static_executable = BoolPtr(true)
 			}
 		} else {
@@ -204,7 +204,7 @@
 	flags = binary.baseLinker.linkerFlags(ctx, flags)
 
 	if ctx.Host() && !binary.static() {
-		if !ctx.AConfig().IsEnvTrue("DISABLE_HOST_PIE") {
+		if !ctx.Config().IsEnvTrue("DISABLE_HOST_PIE") {
 			flags.LdFlags = append(flags.LdFlags, "-pie")
 			if ctx.Windows() {
 				flags.LdFlags = append(flags.LdFlags, "-Wl,-e_mainCRTStartup")