modules: lvgl: support the frame buffer address and stride alignment

Add support for the frame buffer address and stride alignment.
If user set the CONFIG_LV_DRAW_BUF_ALIGN to not be 4, the buffers
shall be allocated aoocrdingly.
If user set the CONFIG_LV_DRAW_BUF_STRIDE_ALIGN to not be 1, the
methods of flushing the display shall set the pitch accordingly.

Signed-off-by: Kate Wang <yumeng.wang@nxp.com>