CAN HAL needs access to /sys/devices to search for USB serial numbers
for SocketCAN devices and for USB serial devices.
Bug: 142654031
Test: Manual + VTS
Change-Id: I3d9bff94f8d8f936f7d859c01b9ff920fcbc5130
SLCAN setup requires certain ioctls and read/write operations to
certain tty's. This change allows the HAL to set up SLCAN devices while
complying with SEPolicy.
In addition to adding support for SLCAN, I've also included permissions
for using setsockopt. In order for the CAN HAL receive error frames from
the CAN bus controller, we need to first set the error mask and filter
via setsockopt.
Test: manual
Bug: 144458917
Bug: 144513919
Change-Id: I63a48ad6677a22f05d50d665a81868011c027898
