[PATCH] ARM: OMAP: MMC updates (SD works)

MMC updates, most significantly for DMA:
    -	Handle small requests like 8 bytes ... this means that the
    	SD patches work on OMAP, in bare-bones mode (that is, no
	writeprotect detection or 4-bit parallel I/O).
    -	Avoid funky half-FIFO-size DMA transfers (they seemed to
    	wedge in one test).
    -	Use packing and bursting for cheaper EMIFF/memory accesses.
Plus a few cleanups:  compiler warnings, comments, init/exit sections,
clk use/unuse, and keeping some line lengths below 80 characters.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>