gpio: mvebu: kill bogus dependency on GPIO_GENERIC

The driver gpio-mvebu.c does not depend on gpio-generic.c at all.
Drop unneeded "select GPIO_GENERIC".
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -307,7 +307,6 @@ config GPIO_MVEBU
 	def_bool y
 	depends on PLAT_ORION
 	depends on OF
-	select GPIO_GENERIC
 	select GENERIC_IRQ_CHIP
 
 config GPIO_MXC