staging: rtl8723bs: move function to file hal/odm_HWConfig.c

move function odm_cck_rssi() to hal/odm_HWConfig.c.
As it is used only in this file turn it to
static.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/c2bb14c3d32d3a654df95288751f0bc8cd6566b0.1628329348.git.fabioaiuto83@gmail.com


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