android_app APEX_GLOBAL_MIN_SDK_VERSION_OVERRIDE

Currently the product variable that is controlled by
APEX_GLOBAL_MIN_SDK_VERSION_OVERRIDE only overrides apexes, but it
doesn't apply to android_apps. This commit allows android_apps which set
updatable: true in their Android.bp to have their min_sdk_version be
overriden by this product variable.

Bug: 295311875
Test: go test
Change-Id: If3cb82a17cae4553b577dd1a4637ee13c3c95302

android/apex.go

@@ -934,6 +934,19 @@ func CheckMinSdkVersion(ctx ModuleContext, minSdkVersion ApiLevel, walk WalkPayl
 	})
 }
 
+// Construct ApiLevel object from min_sdk_version string value
+func MinSdkVersionFromValue(ctx EarlyModuleContext, value string) ApiLevel {
+	if value == "" {
+		return NoneApiLevel
+	}
+	apiLevel, err := ApiLevelFromUser(ctx, value)
+	if err != nil {
+		ctx.PropertyErrorf("min_sdk_version", "%s", err.Error())
+		return NoneApiLevel
+	}
+	return apiLevel
+}
+
 // Implemented by apexBundle.
 type ApexTestInterface interface {
 	// Return true if the apex bundle is an apex_test