Add BUILD_BROKEN_VENDOR_SEAPP_USES_COREDOMAIN

Starting from Android V, vendor seapp_contexts files can't assign
coredomain to vendor apps, as it's Treble violation. This build broken
variable is to suppress the enforcement for devices launching with U or
prior.

Bug: 280547417
Test: set BUILD_BROKEN_VENDOR_SEAPP_USES_COREDOMAIN := true and build
Change-Id: Ic4b5309f0d9bab9b93e88988d1a5a942b2de220a

android/config.go

@@ -1948,6 +1948,10 @@ func (c *deviceConfig) BuildBrokenVendorPropertyNamespace() bool {
 	return c.config.productVariables.BuildBrokenVendorPropertyNamespace
 }
 
+func (c *deviceConfig) BuildBrokenVendorSeappUsesCoredomain() bool {
+	return c.config.productVariables.BuildBrokenVendorSeappUsesCoredomain
+}
+
 func (c *deviceConfig) BuildBrokenInputDir(name string) bool {
 	return InList(name, c.config.productVariables.BuildBrokenInputDirModules)
 }