Pass platform version name as --version-name for framework-res.apk

framework-res.apk should get the platform version name ("9") as
--version-name, not the SDK version ("28").  It will get copied
to compileSdkVersionCodename in APKs compiled against it.

Bug: 78324052
Test: aapt dump badging $OUT/system/framework/framework-res.apk | grep -i version
Change-Id: I34a601cb2c14f66199066e7d598862108da0b950
Merged-In: I34a601cb2c14f66199066e7d598862108da0b950
(cherry picked from commit b691e24d89)

android/config.go

@@ -468,6 +468,10 @@ func (c *config) ResourceOverlays() []string {
 	return *c.productVariables.ResourceOverlays
 }
 
+func (c *config) PlatformVersionName() string {
+	return String(c.productVariables.Platform_version_name)
+}
+
 func (c *config) PlatformSdkVersionInt() int {
 	return *c.productVariables.Platform_sdk_version
 }