Add NATIVE_WINDOW_CONSUMER_IS_PROTECTED enum

The enum is being introduced into libnativewindow, but back ported here
since window-deprecated.h is still being depended by other system
componenets.

Bug: 35726763
Test: videoplayer-nodrm-protected.apk and videoplayer-drm-protected.apk
both works.

Change-Id: I9298ff9b1ddd7f868e59db41e1a84e2cdd3d02b5