pinctrl: amd: Use devm_pinctrl_register() for pinctrl registration

pinctrl: amd: Use devm_pinctrl_register() for pinctrl registration

Use devm_pinctrl_register() for pin control registration and clean
error path.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 251e22abde21833b3d29577e4d8c7aaccd650eee)

Orabug: 27539246
CVE: CVE-2017-18174

Reviewed-by: Shan Hai <shan.hai@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
Minor conflict which checks the pointer with IS_ERR
macro.

Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/pinctrl/pinctrl-amd.c

Signed-off-by: Brian Maly <brian.maly@oracle.com>