arm64: Set ARCH_NR_GPIO to 2048 for ARCH_APPLE

We're already running into the 512 GPIO limit on t600[01] depending on
how many SMC GPIOs we allocate, and a 2-die version could double that.
Let's make it 2K to be safe for now.
Signed-off-by: Hector Martin <marcan@marcan.st>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220502091427.28416-1-marcan@marcan.stSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/Kconfig

@@ -2041,6 +2041,18 @@ config STACKPROTECTOR_PER_TASK
 	def_bool y
 	depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG
 
+# The GPIO number here must be sorted by descending number. In case of
+# a multiplatform kernel, we just want the highest value required by the
+# selected platforms.
+config ARCH_NR_GPIO
+        int
+        default 2048 if ARCH_APPLE
+        default 0
+        help
+          Maximum number of GPIOs in the system.
+
+          If unsure, leave the default value.
+
 endmenu
 
 menu "Boot options"