uboot: Copy recovery with datetime mark

Signed-off-by: zombah <zombah@gmail.com>
Makefile: Dont copy unused apps

Signed-off-by: zombah <zombah@gmail.com>
Makefile: Low mem tweaks

From here http://source.android.com/devices/low-ram.html

Signed-off-by: zombah <zombah@gmail.com>