Remove bootstat access to proc label.

Bug: 65643247
Test: device boots without denials from bootstat to proc.
Change-Id: Ie31a0488239dbb1614fbcce07540d23afa805b0e

public/bootstat.te

@@ -8,9 +8,6 @@ read_runtime_log_tags(bootstat)
 allow bootstat bootstat_data_file:dir rw_dir_perms;
 allow bootstat bootstat_data_file:file create_file_perms;
 
-# Read access to pseudo filesystems (for /proc/uptime).
-r_dir_file(bootstat, proc)
-
 # Collect metrics on boot time created by init
 get_prop(bootstat, boottime_prop)