More Qualcomm ARM32 DeviceTree updates for v6.5

On MSM8960, support for USB is added and the Samsung Galaxy Express is
added.

GPIO keys and on-board LEDs are described for the APQ8074 Dragonboard.

On MSM8226, QFPROM, tsens and thermal zones are defined, and the
description of the clock hierarchy is improved.

The PCIe endpoint controller on SDX55 gains a interconnect path to DDR
defined.

Sony Xperia X2 Tablet and Samsung Galaxy Tab 4 are updated following
changes in the LP855X DeviceTree binding.
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