如何单独 build recovery image
时间：10-02
整理：3721RD
点击：
./makemtk mm bootable/recovery/
./makeMtk r kernel
./makeMtk -opt=ONE_SHOT_MAKEFILE=build/target/board/android.mk r recoveryimage
./makeMtk r kernel
./makeMtk -opt=ONE_SHOT_MAKEFILE=build/target/board/android.mk r recoveryimage