Use 4.9.2 toolchain for kernel

Signed-off-by: kecinzer <kecinzer@gmail.com>
Use 4.10 again and more optimizations

Signed-off-by: kecinzer <kecinzer@gmail.com>
Compile Camera2 and Gallery2

Because I removed those packages in build, I need to add it here.

Signed-off-by: kecinzer <kecinzer@gmail.com>
Optimize linker

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