pinctrl: renesas: No need to initialise global statics

Global static variables don't need to be initialized to 0, because the
compiler will initialize them.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210906134040.96642-1-wangborong@cdjrlc.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>