dt-bindings: pinctrl: Correct the header guard of mt6795-pinfunc.h

Rename the header guard of mt6795-pinfunc.h from __DTS_MT8173_PINFUNC_H to
__DTS_MT6795_PINFUNC_H what corresponding with the file name.

Fixes: 81557a71 ("dt-bindings: pinctrl: Add MediaTek MT6795 pinctrl bindings")
Signed-off-by: Wei Li <liwei391@huawei.com>
Link: https://lore.kernel.org/r/20221108094529.3597920-1-liwei391@huawei.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>