This commit finally adds support for the built in SD/MMC controller in IPQ4019 SoC.
Controller is supported by the upstream SDHCI-MSM driver with a minor clock setting patch.
Patch is special to the IPQ4019 and cannot be upstreamed.
LDO and SDHCI node are upstreamed, and LDO node is awaiting to be accepted.
Signed-off-by: Robert Marko <robimarko@gmail.com>
