staging: rtl8192e: Rename MacBlkCtrl and remove double definition

Rename constant MacBlkCtrl to MAC_BLK_CTRL to avoid CamelCase which is
not accepted by checkpatch. Remove double definition.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/8c0c46860fdb71660183fce567f7bc80e1d1ad36.1675792435.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>