net/ice/base: update driver unloading field

net/ice/base: update driver unloading field

According to recent specification versions, the field in the Queue
Shutdown AdminQ command consisting of the "driver unloading" indication
is not a 4 byte field (it is byte.bit 16.0). Change it to a byte and
remove the unnecessary endian conversion.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Signed-off-by: Leyi Rong <leyi.rong@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>