staging: rtl8192e: Remove wireless modes A, N_5G from _rtl92e_hwconfig

Remove WIRELESS_MODE_N_5G and WIRELESS_MODE_A as those are not supported
by hardware and to improve readability. Combine WIRELESS_MODE_G with
default to improve readability.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/ab96af426f090ac2fe4a2536b052fcf8a2e38aa8.1679949171.git.philipp.g.hortmann@gmail.com


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