ARM: rockchip_defconfig: enable CONFIG_AIO

4ed084e489fd ("Move CONFIG_AIO to android-base.")

CONFIG_AIO has legitimate use for the functionfs
driver, which is used with adb and mtp. It is now
required to be enabled for better performance
with those services.

Change-Id: I52d05c734a25b35e012666b010b2ee5426915094
Signed-off-by: Tao Huang <huangtao@rock-chips.com>

Author: rkhuangtao

arch/arm/configs/rockchip_defconfig

@@ -26,7 +26,6 @@ CONFIG_BLK_DEV_INITRD=y
 # CONFIG_RD_LZ4 is not set
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_KALLSYMS_ALL=y
-# CONFIG_AIO is not set
 CONFIG_EMBEDDED=y
 # CONFIG_VM_EVENT_COUNTERS is not set
 # CONFIG_SLUB_DEBUG is not set