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
diff --git a/android/variable.go b/android/variable.go
index 4ed0507..077b810 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -389,6 +389,8 @@
 	CertificateOverrides         []string `json:",omitempty"`
 	PackageNameOverrides         []string `json:",omitempty"`
 
+	ApexGlobalMinSdkVersionOverride *string `json:",omitempty"`
+
 	EnforceSystemCertificate          *bool    `json:",omitempty"`
 	EnforceSystemCertificateAllowList []string `json:",omitempty"`