pinctrl: ns2: Fix off by one bugs in ns2_pinmux_enable()

The pinctrl->functions[] array has pinctrl->num_functions elements and
the pinctrl->groups[] array is the same way.  These are set in
ns2_pinmux_probe().  So the > comparisons should be >= so that we don't
read one element beyond the end of the array.

Fixes: b5aa1006

 ("pinctrl: ns2: add pinmux driver support for Broadcom NS2 SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20190926081426.GB2332@mwanda
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>