Added rule in recovery_t to access /mnt/sdcard/update_ext4.zip and dontaudit rule for syslog to fix sdcard recovery failure issue under selinux enforcing mode.

Change-Id: Iddaa33b8567aa80b032d216ecee668daeee4bda1
Signed-off-by: Nishith Goswami <ngoswami@qti.qualcomm.com>
Signed-off-by: Nishith Goswami <quic_ngoswami@quicinc.com>