Remove deprecated enable_rkpd property am: f019332f6d

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/2843933

Change-Id: I5ffe70fa49fbb66326e5d46bc1959b65596b0073
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>