[d-kernel] [PATCH] arm64: dts: rockchip: fix compatible string for Repka Pi 5

[Мишаня Бессонов]

The current in-tree device tree for Repka Pi 5 uses "repka,pi5" as its
compatible string. However, the U-Boot bootloader code expects the token
"repka,repka-pi5" for proper board identification and FIT image validation.

Change the compatible string to "repka,repka-pi5" to align the kernel's
DTS with the bootloader. This ensures that variables like fdtfile are
correctly matched and the system boots without manual configuration.