pinctrl: equilibrium: Fix function addition in multiple groups

Ignore the same function with multiple groups.
Fix a typo in error print.

Fixes: 1948d5c5

 ("pinctrl: Add pinmux & GPIO controller driver for a new SoC")
Signed-off-by: Rahul Tanwar <rtanwar@maxlinear.com>
Link: https://lore.kernel.org/r/20211020093815.20870-1-rtanwar@maxlinear.com


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