arm64: dts: renesas: r8a77990: Fix register range of display node

arm64: dts: renesas: r8a77990: Fix register range of display node

Since the R8A77990 SoC uses DU{0,1}, the range from the base address to
the 0x4000 address is used.
This patch fixed it.

Fixes: 13ee2bfc5444 ("arm64: dts: renesas: r8a77990: Add display output support")
Signed-off-by: Takeshi Kihara <[email protected]>
Signed-off-by: Yoshihiro Kaneko <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Simon Horman <[email protected]>