More Qualcomm ARM64 DTS updates for v5.20

Related to SDM845, the Xiaomi Mi Mix2s is introduced, the DB845c on
SDM845 gains support for the second GPI DMA controller and has the GENI
I2C and SPI instances wired up to their respective GPI DMA controller.

QCS404 USB controller and PHY assignment is corrected and IPQ8074 gains
APCS definition to handle outgoing IPC interrupts.

Lastly a range of Devicetree validation issues are addressed.
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