sepolicy : remove regexp for ssr node on sysfs

following node on sysfs is using regexp to support all target
doing so will take longer time in searching and labeling.
/sys/devices(/platform)?/soc/[a-z0-9\.:]+,[a-z0-9\-\_]+/subsys[0-9]+/name

For improving the boot-up time we are moving this to respective target
and later on going to move to genfs_context which will be faster.

This change is just upading the sdm845 target similar changes are needed for
all target till that time they will go with regexp in file_context.

Change-Id: I64fa5a081f04f7a4ebe648c68f0d767d63be710f