RISCV: config: tizen_visionfive2: enable DRM_LOAD_EDID_FIRMWARE

RISCV: config: tizen_visionfive2: enable DRM_LOAD_EDID_FIRMWARE

Enable CONFIG_DRM_LOAD_EDID_FIRMWARE from tizen defconfigs to
support drm.edid_firmware paremeter.
Adding "drm.edid_firmware=edid/1920x1080.bin" to cmdline makes
all connected display connector has the 1920x1080 mode.

Kernel has prebuilt edids, 800x600.bin, 1024x768.bin,
1280x1024.bin, 1600x1200.bin, 1680x1050.bin and 1920x1080.bin
and to use other mode edids, put custom edid files into path
/lib/firmware/edid/.

Note: to build custom edid binary, please refer tools/edid/.

Change-Id: Ia87be1d9f7a5e6af38201dc432fc046478e80dae
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>