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/avengers_lite.c b/arch/arm/mach-mmp/avengers_lite.c
index 39f0878..c5d53e0 100644
--- a/arch/arm/mach-mmp/avengers_lite.c
+++ b/arch/arm/mach-mmp/avengers_lite.c
@@ -38,6 +38,7 @@
 
 	/* on-chip devices */
 	pxa168_add_uart(2);
+	platform_device_register(&pxa168_device_gpio);
 }
 
 MACHINE_START(AVENGERS_LITE, "PXA168 Avengers lite Development Platform")