fix(cpus): workaround for Cortex-A520 erratum 2630792

Cortex-A520 erratum is a Cat B erratum that applies
to revisions r0p0 and r0p1 and is still open.
The workaround is to set CPUACTLR_EL1[38] to 1.

SDEN Documentation:
https://developer.arm.com/documentation/SDEN-2444153/latest

Change-Id: Idb6f32f680ee1378a57c2d2f809ea847fffe5910
Signed-off-by: Sona Mathew <sonarebecca.mathew@arm.com>
5 files changed