ice: move get_fwlog_data() to fwlog file

ice: move get_fwlog_data() to fwlog file

Change the function prototype to receive hw structure instead of pf to
simplify the call. Instead of passing whole event pass only msg_buf
pointer and length.

Make ice_fwlog_ring_full() static as it isn't  called from any other
context.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>