linux-phytec-fsl

MX7FLY-84 dts: imx7d-phycore-som: emmc: add sd3 strobe signal

Strobe signal is required for HS400 mode.
This is needed for phyCORE-i.MX7 SOM PCM-061-2110111C.A1,
which is populated with eMMC 5.0.

Signed-off-by: Anna Horstmann <ahorstmann@phytec.com>
(cherry picked from commit a26032bca5dc475d0380773deca5721198964ef0)