soc: mediatek: Make symbol 'mtk_mutex_driver' static

The sparse tool complains as follows:

drivers/soc/mediatek/mtk-mutex.c:464:24: warning:
 symbol 'mtk_mutex_driver' was not declared. Should it be static?

This symbol is not used outside of mtk-mutex.c, so this
commit marks it static.

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Wei Yongjun <[email protected]>
Reviewed-by: Chun-Kuang Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Matthias Brugger <[email protected]>

0 files changed, 0 insertions, 0 deletions