Revert "firmware: arm_scmi: Add a common helper to check if a message is supported"

This reverts commit 67a50f57 which is
commit 637b6d6c upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I82ce5a24c8c9d1459b6222c30c330b393340fdbe
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>