staging: rtl8188eu: Remove command _Set_H2C_MSG and its handler

_Set_H2C_MSG command is never issued by driver and its handler is a
dummy function.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/rtl8188eu/core/rtw_mlme_ext.c
Simple merge

diff --cc drivers/staging/rtl8188eu/include/rtw_cmd.h
Simple merge

diff --cc drivers/staging/rtl8188eu/include/rtw_mlme_ext.h
Simple merge