In AARCH32, CCIDX support is indicated in the MMFR4 register - unlike under AARCH64 where it's in MMFR2. Add a helper function to read it. Signed-off-by: Rebecca Cran <rebecca@nuviainc.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Leif Lindholm <leif@nuviainc.com>