ofono apparmor policy update for sys/class/usbmisc related to sysfs

apparmor-ofono test case is failing as apparmor is rejecting the 'operation:open name:/sys/class/usbmisc/'

Fix: Added the read operation for /sys/class/usbmisc/

Apertis: T5897

Signed-off-by: Tarun Baghmar tarun.baghmar@in.bosch.com