drm/stm: check pitch and size calculations even if !CONFIG_MMU

In all cases we have to check pitch and size calculations to speed up
data transfer.

Fixes: 21f815bf ("drm/stm: drv: Improve data transfers")
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180131080508.14356-1-benjamin.gaignard@linaro.org

drivers/gpu/drm/stm/drv.c

@@ -35,7 +35,6 @@ static int stm_gem_cma_dumb_create(struct drm_file *file,
 				   struct drm_device *dev,
 				   struct drm_mode_create_dumb *args)
 {
-#ifdef CONFIG_MMU
 	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 
 	/*
@@ -44,7 +43,6 @@ static int stm_gem_cma_dumb_create(struct drm_file *file,
 	 */
 	args->pitch = roundup(min_pitch, 128);
 	args->height = roundup(args->height, 4);
-#endif
 
 	return drm_gem_cma_dumb_create_internal(file, dev, args);
 }