drivers/gpu: include <module.h> for modular rockchip code

These files are built off of a tristate Kconfig option and also contain
modular function calls so they should explicitly include module.h to
avoid compile breakage during header shuffles done in the future.

Cc: David Airlie <airlied@linux.ie>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>