remove obsolete system property operations

Bug: 184213723
Test: The following error logs were gone
03-25 17:03:04.317 E init    : Do not have permissions to set 'ro.debug_level' to '0x494d' in property file '/vendor/build.prop': SELinux permission check failed
03-25 17:03:04.317 E init    : Do not have permissions to set 'ro.arch' to 'gs101' in property file '/vendor/build.prop': SELinux permission check failed

Change-Id: I1326752935665568285971944366e9e977ef9013
1 file changed