staging: udlfb: Add intro udlfb documentation
staging: udlfb: Add intro udlfb documentation

Add documentation for the udlfb framebuffer driver for DisplayLink devices.

Signed-off-by: Bernie Thompson <853520c0eaeb91fa22b7d2c2bb860b746e447d45@plugable.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@suse.de>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs