rk3288:update ddr loader and miniloader

support rk32 usbplug and DDR init

rk3288: update rk3288 img build

add mini all debug

remove unused file

add rk3026

remove unused file

update mini loader, fix flash error when flash loader from 1.24

support nand flash.

add miniall loader

update rkMiniLoaders, for new uboot loader header.

fix merge 3188 error

Change-Id: I6407dc263dbbfe630b6038310957a14823f13f91

modify ddr init code

update rkminiloader,support RSA KEY in mini loader

speed up fastboot write image

update ddr init

add boot merger

add rkMiniLoader.bin

update ddr init, fix maskrom io short,modify odt

update boot_merger, for 32-bit host.

update boot_merger.

mod boot_merger, convert unknown type from chip name.

rkuboot: fixed rk3168 chip name error.

rkuboot: makefile support rk3168.

RK3168:support rk3168 uboot