adfuload: add test program

This test program. I add it mainly to document somehow my work:
1) atj213x.h    lists registers addresses
2) crt0.S       exploits self relocation of the binary
3) test_bl.c    documents how to control backlight on e150

Change-Id: I055e0fe065d926a5c3805b73cea3f537cb64bf52
7 files changed