gpio: GPIO_BLZP1600 should depend on ARCH_BLAIZE

gpio: GPIO_BLZP1600 should depend on ARCH_BLAIZE

The Blaize BLZP1600 GPIO controller is only present on BLaize BLZP1600
SoCs.  Hence add a dependency on ARCH_BLAIZE, to prevent asking the user
about this driver when configuring a kernel without Blaize platform
support.

Fixes: 602ae04f56542d8e ("gpio: Enable Blaize BLZP1600 GPIO support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Nikolaos Pasaloukos <nikolaos.pasaloukos@blaize.com>
Link: https://lore.kernel.org/r/a75af4b623579a193b4a59350c063969aabb5b71.1744190524.git.geert+renesas@glider.be
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>