firmware: hdmi: disable dhcp completely to avoid registered i2c user

See: raspberrypi#192

firmware: threadx: Avoid calling a NULL interrupt handler
See: raspberrypi#192

firmware: arm_loader: Load standard touchscreen overlay

firmware: di_adv: Remove dma and copy non interlaced lines from shader

firmware: di_adv: Add vector code for copying top/bottom lines

firmware: di_adv: Do not deinterlace first frame and have one less frame of latency