arm64: dts: renesas: r8a77965: Fix HS-USB compatible

Should be "renesas,usbhs-r8a77965", not "renesas,usbhs-r8a7796".

Fixes: a06e8af8 ("arm64: dts: renesas: r8a77965: add HS-USB node")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>