Flag to globally override apexes' min_sdk_version

Override all mainline updateable apexes' min_sdk_version
to same version to get single shared native libs on DCLA.

Test: Run "vendor/google/build/go/mainline_go_modules_arm.sh" and inspect built apexes
Bug: 212609891
Change-Id: Ide7d3f2bc772ac6240f1c917b87285d051d6f605
Merged-In: Ide7d3f2bc772ac6240f1c917b87285d051d6f605

android/config.go

@@ -1360,6 +1360,10 @@ func findOverrideValue(overrides []string, name string, errorMsg string) (newVal
 	return "", false
 }
 
+func (c *deviceConfig) ApexGlobalMinSdkVersionOverride() string {
+	return String(c.config.productVariables.ApexGlobalMinSdkVersionOverride)
+}
+
 func (c *config) IntegerOverflowDisabledForPath(path string) bool {
 	if len(c.productVariables.IntegerOverflowExcludePaths) == 0 {
 		return false