drm/msm: provide fb_dirty implemenation

Since commit 93e81e38e197 ("drm/fb_helper: Minimize damage-helper
overhead") the drm_fb_helper_funcs::fb_dirty helper is required for
proper dirty/damage processing. The drm/msm driver requires that to
function to let CMD panels to work. Use simplified version of
drm_fbdev_generic_helper_fb_dirty() to fix support for CMD mode panels.

Reported-by: Degdag Mohamed <[email protected]>
Fixes: 93e81e38e197 ("drm/fb_helper: Minimize damage-helper overhead")
Cc: Thomas Zimmermann <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Marijn Suijten <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/542002/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

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