avr32: do away with ARCH_REQUIRE_GPIOLIB

Replace "select ARCH_REQUIRE_GPIOLIB" with "select GPIOLIB"
as this can now be selected directly.

Cc: Michael Büsch <m@bues.ch>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Acked-by: Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/avr32/Kconfig

@@ -74,7 +74,7 @@ config PLATFORM_AT32AP
 	select SUBARCH_AVR32B
 	select MMU
 	select PERFORMANCE_COUNTERS
-	select ARCH_REQUIRE_GPIOLIB
+	select GPIOLIB
 	select GENERIC_ALLOCATOR
 	select HAVE_FB_ATMEL