pinctrl: samsung: Constify samsung_pin_bank_type struct

This structure is not intended to be modified at runtime and functions
as constant data shared between multiple pin banks. This patch makes all
instances of it constant across the driver.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>

diff --cc drivers/pinctrl/samsung/pinctrl-exynos.c
Simple merge

diff --cc drivers/pinctrl/samsung/pinctrl-s3c24xx.c
Simple merge

diff --cc drivers/pinctrl/samsung/pinctrl-s3c64xx.c
Simple merge

diff --cc drivers/pinctrl/samsung/pinctrl-samsung.c
Simple merge

diff --cc drivers/pinctrl/samsung/pinctrl-samsung.h
Simple merge