drm/gma500/gem: Include our own header containing prototypes

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/gma500/gem.c:59:5: warning: no previous prototype for ‘psb_gem_create’ [-Wmissing-prototypes]

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181313.3431493-33-lee.jones@linaro.org

drivers/gpu/drm/gma500/gem.c

@@ -16,6 +16,7 @@
 #include <drm/drm.h>
 #include <drm/drm_vma_manager.h>
 
+#include "gem.h"
 #include "psb_drv.h"
 
 static vm_fault_t psb_gem_fault(struct vm_fault *vmf);