staging: r8188eu: remove PGMaxGroup from struct hal_data_8188e

the variable PGMaxGroup in struct hal_data_8188e is set to 13 and
never changed. We can use the already defined constant MAX_PG_GROUP,
which is 13, and remove PGMaxGroup from struct hal_data_8188e.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220201084259.7497-3-straube.linux@gmail.com


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