fix(morello): fix SoC reference clock frequency

Morello Specification specifies the system
reference clock frequency as 50MHz so the frequency
has been changed from 100MHz to 50MHz.

Change-Id: I25577b04aa54ed82b7e9df69ac8e40ac54a9b111
Signed-off-by: Anurag Koul <anurag.koul@arm.com>
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
1 file changed