CRISv32: Add GPIO driver to the default configs

Fix a number of small issues visible when GPIO is enabled:

- Correct missing default for !ETRAXFS in Kconfig
- Remove information on number of bits for some Kconfigs
  related to the GPIO, they are different in ETRAX FS and ARTPEC-3
- Fix compile warning in ARTPEC-3 GPIO driver

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

diff --cc arch/cris/arch-v32/drivers/Kconfig
Simple merge

diff --cc arch/cris/arch-v32/drivers/mach-a3/gpio.c
Simple merge

diff --cc arch/cris/configs/artpec_3_defconfig
Simple merge

diff --cc arch/cris/configs/etraxfs_defconfig
Simple merge