Add basic HAL device for the official DSI display/touchscreen. Delete superfluous code.
Detail: Makefile, s/Touch - Basic HAL device for the official touchscreen, which just exposes the address of the buffer which the GPU periodically fills with a register dump of the touchscreen controller. hdr/BCM2835 - Remove old comment. Add new tag for getting the touchscreen buffer address. hdr/StaticWS - Remove old workspace entries. Add new entries for touchscreen. s/Messaging - Remove the messagebox tags which set a screen mode on startup (BCMVideo will handle that for us), and just blank the screen instead (to stop the GPU displaying a coloured square). Add tag to get the touchscreen buffer address. s/Top - Register touchscreen HAL device during HAL_InitDevices. Remove more old code. Admin: Tested on Raspberry Pi 1 B Version 0.50. Tagged as 'BCM2835-0_50'
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