The White Hawk CSI/DSI and RAVB/Ethernet(1000Base-T1) sub boards are not
specific to R-Car V4H.

Hence rename their DTS file names to drop the "r8a779g0-" prefix, and
remove any references to R-Car V4H.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/f89613d0df04cfa6196f8797fe655cf7cec812de.1706192990.git.geert+renesas@glider.be