rk3188_box_sm3188b_kitkat_defconfig: add for sm3188b
board-rk3188-box.c: change i2c controller for rk616 from i2c2 to i2c4
board-rk3188-box.c: change voltage of ldo6 from 1.8v to 3.3v
AndroidKernel.mk: do not support separate build

Dam...t, the kernel makefile does not support separate build.
Return to old days...