bullhead: fix nanoapp_cmd permission denieds on uninstall

avc: denied { dac_override } for capability=1 scontext=u:r:nanoapp_cmd:s0 tc
ontext=u:r:nanoapp_cmd:s0 tclass=capability permissive=0
nanoapp_cmd: Failed to open /dev/nanohub: err=13 [Permission denied]

nanoapp_cmd runs as root:system, so needs group write access

Bug: 63404254
Test: boot and check permissions on /dev/nanohub are crw-rw---- and
      that uninstall succeeds
Signed-off-by: Ben Fennema <fennema@google.com>

Change-Id: I1d18e6c3908679e083056899413d464921b33fb8
1 file changed