Remove proc label access from kernel domain.

Bug: 65643247
Test: sailfish boots, can take pictures, use browser without denials
form kernel domain.
Change-Id: I4fc0555f0b65fc5537e0b2765142b384ed0560c8

public/kernel.te

@@ -5,7 +5,6 @@ allow kernel self:capability sys_nice;
 
 # Root fs.
 r_dir_file(kernel, rootfs)
-r_dir_file(kernel, proc)
 allow kernel proc_cmdline:file r_file_perms;
 
 # Get SELinux enforcing status.