Add support for no-vendor-variant VNDK

When no-vendor-variant VNDK is enabled, the vendor variant of VNDK
libraries are not installed.  Since not all VNDK libraries will be
ready for this, we keep a list of library names in cc/vndk.go to
indicate which libraries must have their vendor variants always
installed regardless of whether no-vendor-variant VNDK is enabled.

Also add --remove-build-id option to the strip script to facilitate
the check of functional identity of the two variants.

Bug: 119423884
Test: Add a dummy VNDK library and build with
      TARGET_VNDK_USE_CORE_VARIANT := true, with the corresponding
      build/make change.

Change-Id: Ieb1589488690e1cef1e310669a8b47a8b8759dac
diff --git a/android/config.go b/android/config.go
index 1520739..7679f29 100644
--- a/android/config.go
+++ b/android/config.go
@@ -818,6 +818,10 @@
 	return c.config.productVariables.ExtraVndkVersions
 }
 
+func (c *deviceConfig) VndkUseCoreVariant() bool {
+	return Bool(c.config.productVariables.VndkUseCoreVariant)
+}
+
 func (c *deviceConfig) SystemSdkVersions() []string {
 	return c.config.productVariables.DeviceSystemSdkVersions
 }