staging: r8188eu: rename Hal_GetChnlGroup88E()

Rename Hal_GetChnlGroup88E() to avoid camel case.
HalGetChnlGroup88E -> hal_get_chnl_group_88e

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210813073109.25609-5-straube.linux@gmail.com


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