ARM: gic: Use _no_log variants while accessing some registers

Some GIC register accesses happens more frequently flooding the
RTB logs. Since they're not that useful for debugging purposes,
use _no_log variants while accessing those registers.

Change-Id: I13b57f5a069bf732f1b9d9f0afb87d291cc5dd48
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>