Revert "ANDROID: mpam: add vendor hook to record MPAM"

This reverts commit 1aa1f6a7.

The hook android_vh_mpam_set is not used by any vendor, so remove
it to help with merge issues with future LTS releases.

If this is needed by any real user, it can easily be reverted to add it
back and then the symbol should be added to the abi list at the same
time to prevent it from being removed again later.

Bug: 203756332
Bug: 165333282
Cc: C-J.Chen <C-J.Chen@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I18356743538df7d41a00f54479bf2a0bc3a62e06