arm64: zynqmp: Add resets property to sdhci nodes

Add "resets" property to sdhci nodes.
resets property is used to reset the SD host controller when
dynamic configuration support is enabled.

Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/f1fe39259c45a37aae56c2835ee8ba187c889d25.1646060367.git.michal.simek@xilinx.com