dts: qcs404-evb: import DT from Linux

Following the other boards, pull in the SoC and PMIC DTSI files from
Linux and adjust the board to use it.

Some U-Boot specific adjustments are still needed, so we can't use fully
upstream DT quite yet.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
8 files changed