ARM: pxa: change gpio to platform device

Remove most gpio macros and change gpio driver to platform driver.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
diff --git a/arch/arm/mach-mmp/tavorevb.c b/arch/arm/mach-mmp/tavorevb.c
index 331f5f3..bb2ddb7 100644
--- a/arch/arm/mach-mmp/tavorevb.c
+++ b/arch/arm/mach-mmp/tavorevb.c
@@ -94,6 +94,7 @@
 
 	/* on-chip devices */
 	pxa910_add_uart(1);
+	platform_device_register(&pxa910_device_gpio);
 
 	/* off-chip devices */
 	platform_device_register(&smc91x_device);