arm64: dts: renesas: r8a774e1: Rename i2c_dvfs to iic_pmic

As RZ/G2 SoCs do not support DVFS, the "iic-dvfs" module was renamed to
"iic-pmic" in the RZ/G Series, 2nd Generation User’s Manual: Hardware
Rev. 1.00.

See also commit a636d803 ("arm64: dts: renesas: rzg2: Rename
i2c_dvfs to iic_pmic"), which apparently forgot to update RZ/G2H.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/7d60653d4d63904dc025a133297a53eb885fa064.1661525361.git.geert+renesas@glider.be