u-boot: add patch to enable CONFIG_SUPPORT_RAW_INITRD

Guys, enabling this in u-boot would make my ubuntu/debian images work out of the box with the factory images.. ;) I'm implementing a workaround for this weekend, for the initial launch beaglebone blacks...

Without:
reading initrd.net
9513834 bytes read in 1083 ms (8.4 MiB/s)
reading /dtbs/am335x-boneblack.dtb
23334 bytes read in 11 ms (2 MiB/s)
Wrong Ramdisk Image Format
Ramdisk image is corrupt or invalid
gpio: pin 55 (gpio 55) value is 1
** Invalid partition 2 **
U-Boot# 

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>