Makes IR driver stop defining and registering its own platform_device.
Also make it properly declare its DMA capability.

Issues noted with IR driver:  DMA should just map/unmap SKB data;
no UART1 support; SIR/MIR/FIR selection uses board-specific code.
And there's no OMAP_TAG saying whether IRDA is even relevant.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>