ARM: dts: berlin: add the SDHCI nodes for the BG2Q

Add the SDHCI nodes for the Marvell Berlin BG2Q, using the mrvl,pxav3-mmc
driver.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
ARM: dts: berlin: enable SD card reader and eMMC for the BG2Q DMP

Enable the SD Card reader and the internal eMMC on the Berlin BG2Q DMP
using two of the SDHCI nodes of the Berlin BG2Q.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>