Integrate linux-imx-kuk/add_emmc_mc3

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Commit: seco-ne/kernel/linux-imx-kuk@57cb5691

dts:mc3: Added eMMC and SD-Card pinctrl groups and nodes

Note: The eMMC isn't working yet.

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Commit: seco-ne/kernel/linux-imx-kuk@1acab19a

dts:mc3: Reformat of the pmic node and eqos pinctrl group

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Commit: seco-ne/kernel/linux-imx-kuk@f9d60e47

dts:mc3: Added voltage regulator nodes

Added nodes for the generic voltages and three nodes for the eMMC and
SD-Card (the SD-Card requires a 1V8 and 3V3 rail for the high-speed mode).

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Commit: seco-ne/kernel/linux-imx-kuk@460238cb

dts:mc3: Added MC3 devicetree to Makefile

SRCREV.conf

@@ -7,7 +7,7 @@ SRCREV:pn-gfxml2dto = "ab5f14f86cff9ae27fbbc7765f9a1b06824dbd2a"
 SRCREV:pn-seco-show-demo = "e6c40f81c575093a73b96b83a3439d68cdd62bcb"
 SRCREV:pn-libmdb = "55460e3e3354883533be3554e9ede3303d626f7b"
 SRCREV:pn-linux-guf = "46b3952e3b35b91088408cf4e607fcf781fe963f"
-SRCREV:pn-linux-imx = "ea28f79061affc340ea2e48afca1a31279ab2058"
+SRCREV:pn-linux-imx = "57cb56917eed8e994e297ebdd4723d379a0a01f2"
 SRCREV:pn-linux-imx-kuk = "6eac325df3391a9501d7a2fb8ef098f8928b9a60"
 SRCREV:pn-touchcal-conv = "1e8a19e459299c4a77de9b04a1828a79613d7eea"
 SRCREV:pn-u-boot-imx = "cedbe2148f087d8fed93db26e5daee49d18113ad"