ixgbe: fix ixgbe_orom_civd_info struct layout

The current layout of struct ixgbe_orom_civd_info causes incorrect data
storage due to compiler-inserted padding. This results in issues when
writing OROM data into the structure.

Add the __packed attribute to ensure the structure layout matches the
expected binary format without padding.

Fixes: 70db0788 ("ixgbe: read the OROM version information")
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>