add a .config suitable for fc20

(cherry picked from commit d6f9ba9abe3c5a2e9a629578373bf317d9434bde)
work around non-working uhs mode

(cherry picked from commit 3dec5836da77d0ec4041711486c0c3a4ee75b8e7)
add README.md

(cherry picked from commit c22285663a64e168995fa9da4da4028b654a3dbb)
add rmk's cubox-i/hummingboard patches
update imx-hdmi.c

(cherry picked from commit bac980f96cda1db230f2ee5bae7344742b6a4e9b)