enable gpio sysfs support

SVN-Revision: 12527

target/linux/ar71xx/config-2.6.26

@@ -67,6 +67,7 @@ CONFIG_GENERIC_FIND_NEXT_BIT=y
 CONFIG_GENERIC_GPIO=y
 # CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ is not set
 # CONFIG_GPIO_MCP23S08 is not set
+CONFIG_GPIO_SYSFS=y
 CONFIG_HAS_DMA=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT=y