drive-impedance-ohm is introduced for emmc phy instead of pcie phy.

Fixes: fb8b7460 ("arm64: dts: rockchip: Define drive-impedance-ohm for RK3399's emmc-phy.")
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://lore.kernel.org/r/1647336426-154797-1-git-send-email-shawn.lin@rock-chips.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>