[Feature][ZXW-310]Optimize RTC code

Only Configure: No
Affected branch: master
Affected module:rtc
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I3039f2a33c1b2194c3a23d09d288ca01ea99dae8
1 file changed