- Use unsigned bitfields in 'lcd_tgt_config'
- Set DTIMES when using an 8-bit bus width
- Allow using DMA big-endian mode
- Provide an #ifdef to avoid stopping DMA in the middle of a frame
- Correctly #ifdef LCD sleep code when target does not implement it
Change-Id: I327c6b05223638b876d5ab62cb6e48f82e6d5fa5