[PATCH v2] ARM: dts: qcom: Update msm8974/apq8074 device trees

* Move SoC peripherals into an SoC container node * Move serial enabling into board file (qcom-apq8074-dragonboard.dts) * Move spi pinctrl into board file * Cleanup cpu node to match binding spec, enable-method and compatible should be per cpu, not part of the container * Drop interrupts

[PATCH v2] ARM: dts: qcom: Update msm8974/apq8074 device trees

* Move SoC peripherals into an SoC container node * Move serial enabling into board file (qcom-apq8074-dragonboard.dts) * Move spi pinctrl into board file * Cleanup cpu node to match binding spec, enable-method and compatible should be per cpu, not part of the container * Drop interrupts