sdm660: Generate contexts for rtc

[   14.612920] type=1400 audit(1601989375.643:13): avc: denied { open } for comm="system_server" path="/sys/devices/soc/800f000.qcom,spmi/spmi-0/spmi0-00/800f000.qcom,spmi:qcom,pm660@0:qcom,pm660_rtc/rtc/rtc0/hctosys" dev="sysfs" ino=33519 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=1
[   14.612933] type=1400 audit(1601989375.643:14): avc: denied { getattr } for comm="system_server" path="/sys/devices/soc/800f000.qcom,spmi/spmi-0/spmi0-00/800f000.qcom,spmi:qcom,pm660@0:qcom,pm660_rtc/rtc/rtc0/hctosys" dev="sysfs" ino=33519 scontext=u:r:system_server:s0 tcontext=u:object_r:sysfs:s0 tclass=file permissive=1

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>
Change-Id: If6b278de0a67086595cee21395d1ceaf52fbef28