pinctrl: equilibrium: Fix function addition in multiple groups

pinctrl: equilibrium: Fix function addition in multiple groups

BugLink: https://bugs.launchpad.net/bugs/1951822
[ Upstream commit 53b3947ddb7f309d1f611f8dc9bfd6ea9d699907 ]

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

Fixes: 1948d5c51dba ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>