script: add a build script for amlogic boards

script: add a build script for amlogic boards

Add a build script for amlogic boards.

For Odroid-C4/N2, it will create the below files.
- odroid/Image.gz
- meson64-odroidc4.dtb
- meson64-odroidn2_drm.dtb
- modules.img (with ${version}-TIZEN-amlogic-odroid+)

For Khadas VIM3/VIM3L, it will create the below files.
- kvim/Image.gz
- kvim3_linux.dtb
- kvim3l_linux.dtb
- modules.img (with ${version}-TIZEN-amlogic-kvim+)

For 'all' boards build, it will create the below files.
- odroid/Image.gz
- kvim/Image.gz
- meson64-odroidc4.dtb
- meson64-odroidn2_drm.dtb
- kvim3_linux.dtb
- kvim3l_linux.dtb
- modules.img (with ${version}-TIZEN-amlogic-odroid+ and ${version}-TIZEN-amlogic-kvim+)

Change-Id: I7bd9ae47576ab53d206b7c268f035b244a22f8e2
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
[sw0312.kim: add to support 'all' board option]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>