drm: zynq_drm: drv: Check formats in fb_create()

Add zynq_drm_fb_create() for drm_mode_config_funcs to check formats.
More format checks and information can be added later.

Signed-off-by: hyun woo kwon <hyunk@xilinx.com>
drm: zynq_drm: Change IO macros using static inline

Change IO read/write macros using static inline functions.
This helps to detect the type errors.

Signed-off-by: hyun woo kwon <hyunk@xilinx.com>
drm: zynq_drm: Fix minor warnings and indentation

Fix small compilation warnings and indentations.

Signed-off-by: hyun woo kwon <hyunk@xilinx.com>