drivers: net: can: Add suspend/resume routine for CAN driver

Make the CAN interrupt as a wakeup capable interrupt and also add
suspend/resume routine to handle the suspend/resume states of
the device

Change-Id: I0e972f3c4b005b52fb8d2e03f83995ecd3c47538
Signed-off-by: Abinaya P <abinayap@codeaurora.org>