More build fixes for omapdrm in current -next

[Arnd Bergmann]

A couple more errors showed up in linux-next in the last few
days, all because of missing header files. I have not seen these
before, and most configurations appear to be fine. There
must have been an implicit inclusion somewhere before that
just got removed, but I couldn't find it and doing the
explicit #include should always be better here.

Please apply for 4.7 to avoid regressing on randconfig builds.

	Arnd