linux/types.h and linux/list.h should be included so the typed used in
the header file are always properly declared.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Reported-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>