gpiolib: make names array and its values const

gpiolib: make names array and its values const

gpiolib doesn't need to modify the names and I assume most initializers
use string constants that shouldn't be modified anyhow.

[[email protected]: fix drivers/gpio/cs5535-gpio.c]
Signed-off-by: Uwe Kleine-König <[email protected]>
Cc: Kevin Wells <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>