uboot-imx

arm64: a37xx: remove old pinctrl implementation

Since the new pinctrl/gpio driver is used, so this patch removes
the old board specific pin control settings.

Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>