Allow kernel to read proc

Remove audit messaged.

Addresses:
avc:  granted  { read } for  pid=1 comm="init" name="cmdline" dev="proc" ino=4026535448 scontext=u:r:kernel:s0 tcontext=u:object_r:proc:s0 tclass=file
avc:  granted  { read open } for  pid=1 comm="init" path="/proc/cmdline" dev="proc" ino=4026535448 scontext=u:r:kernel:s0 tcontext=u:object_r:proc:s0 tclass=file

Bug: 28760354
Change-Id: I48ea01b35c6d1b255995484984ec92203b6083be