MLK-19199 drm/imx: lcdif: replace FB width usage for cropping

MLK-19199 drm/imx: lcdif: replace FB width usage for cropping

According to the comments of 'struct drm_framebuffer', its
'width' field refers to the logical width of the visible
area of the framebuffer. This may be unequal to the total
pixels number of a line. So use the 'pitches' field to
replace 'width' for the horizontal cropping feature.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
(cherry picked from commit 9a2bbbf971ed79b32ae1c7da2d62b8a72f3ccffd)
(cherry picked from commit 0649fa3e27916edf43dcb9f1edc965e2cf1175e1)