updata usbplug.bin,support 3188A

add ddr init code 20130517. support 3188A

mod CHIP.ini, RK310B->0x70.

change to RK310B.

update boot_merger, parse extra chip type defs in CHIP.ini

set default config to 3188

modify 3188 config

update boot_merger, support unpack.

add boot_merger.

modify 3188 merger tool config

modify uboot version

rkuboot: rkmerge tool add 3188 ddr bin.

add init stack in lowlevel init, add reset cpu function

readd rk bin

move Tools to tools/rk_tools