HTC Dream: mmc compilation fixes

Add missing include for msm_sdcc compilation, and remove pwrsink
support that is not mainline, yet.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
[dwalker@codeaurora.org : fixed indent in mmc.h]
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>