gpio: mpc8xxx: Support controller register physical address beyond 32-bit

dev_read_addr_size_index() returns fdt_addr_t which might be a
64-bit physical address. This might be true for some 85xx SoCs
whose CCSBAR is mapped beyond 4 GiB.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

arch/powerpc/include/asm/arch-mpc85xx/gpio.h

@@ -18,7 +18,7 @@
 #endif
 
 struct mpc8xxx_gpio_plat {
-	ulong addr;
+	phys_addr_t addr;
 	unsigned long size;
 	uint ngpios;
 };