to insert a 0-byte into the Rx stream

 - added UART shutdown req/rsp msg
 - updated location where UART close called so its not called while atomic

was a NULL pointer was getting passed to cfg80211.

Put back commented out CAN drivers

Some kernel incompatibility had to be worked around in order to build
sucessfully for both the wp85 and wp76.

The modules should not be enabled yet because the kernel required to
build the modules is not available yet.

Updated uart driver to return error if file closed vs. WARN_ON
Updated mtwifi init script to kill wpa_supplicant for mt7697

Updated some debug messages in MT7697wifi