drm/imagination: Implement handling of context reset notification

drm/imagination: Implement handling of context reset notification

The firmware will send the context reset notification message as
part of handling hardware recovery (HWR) events deecoding the message
and printing via drm_info(). This eliminates the "Unknown FWCCB command"
message that was previously printed.

Co-developed-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Alexandru Dadu <alexandru.dadu@imgtec.com>
Reviewed-by: Matt Coster <matt.coster@imgtec.com>
Link: https://patch.msgid.link/20260323-b4-firmware-context-reset-notification-handling-v3-3-1a66049a9a65@imgtec.com
Signed-off-by: Matt Coster <matt.coster@imgtec.com>