Fix the device node names as "mmc@".

Fixes: 663386c3 ("arm64: dts: renesas: r8a774a1: Add SDHI nodes")
Fixes: 9b33e300 ("arm64: dts: renesas: Initial r8a774b1 SoC device tree")
Fixes: 77223211 ("arm64: dts: renesas: r8a774c0: Add SDHI nodes")
Fixes: d9d67010 ("arm64: dts: r8a7795: Add SDHI support to dtsi")
Fixes: a513cf1e ("arm64: dts: r8a7796: add SDHI nodes")
Fixes: 111cc9ac ("arm64: dts: renesas: r8a77961: Add SDHI nodes")
Fixes: f51746ad ("arm64: dts: renesas: Add Renesas R8A77961 SoC support")
Fixes: df863d6f ("arm64: dts: renesas: initial R8A77965 SoC device tree")
Fixes: 9aa3558a ("arm64: dts: renesas: ebisu: Add and enable SDHI device nodes")
Fixes: 83f18749 ("arm64: dts: renesas: r8a77995: Add SDHI (MMC) support")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1594382634-13714-1-git-send-email-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>