Added access to proc_uptime and proc_asound to address these denials:

avc: denied { read } for name="uptime" dev="proc" ino=4026532080
scontext=u:r:shell:s0 tcontext=u:object_r:proc_uptime:s0 tclass=file
permissive=1

avc: denied { getattr } for path="/proc/asound/version" dev="proc"
ino=4026532017 scontext=u:r:shell:s0 tcontext=u:object_r:proc_asound:s0
tclass=file permissive=1

Bug: 65643247
Test: device boots with no denial from 'shell' domain.
Test: lsmod, ps, top, netstat
Test: No denials triggered from CtsSecurityHostTestCases
Test: external/toybox/run-tests-on-android.sh does not pass, but triggers
no denials from 'shell' domain to 'proc' type.

Change-Id: Ia4c26fd616e33e5962c6707a855dc24e338ec153