staging: r8188eu: add spaces around P2P_AP_P2P_CH_SWITCH_PROCESS_WK

Remove checkpatch.pl error by adding spaces
around P2P_AP_P2P_CH_SWITCH_PROCESS_WK.

Signed-off-by: Alberto Merciai <alb3rt0.m3rciai@gmail.com>
Link: https://lore.kernel.org/r/20220103115633.221853-1-alb3rt0.m3rciai@gmail.com


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