msm: msm-pm: use proper co-processor instructions

Existing assembly instructions are not valid
for AArch64 mode for ARMv8 targets. Use proper
co-processor instructions for AArch64 mode for
ARMv8 targets to read the cache properties.

Change-Id: If4e97d5016e0bd52d7e57b5639e200b3601e0412
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>