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 <[e-mail]>
Cc: Haavard Skinnemoen <[e-mail]>
Acked-by: Acked-by: Hans-Christian Noren Egtvedt <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

arch/avr32/Kconfig

···
 	select SUBARCH_AVR32B
 	select MMU
 	select PERFORMANCE_COUNTERS
-	select ARCH_REQUIRE_GPIOLIB
+	select GPIOLIB
 	select GENERIC_ALLOCATOR
 	select HAVE_FB_ATMEL