aries: dts: move intc to soc and fix formatting
FM: Add iris_fm device to device tree

Remove the device from board file and moved it to
device tree.
Add device tree documentation for iris_fm platform
driver.

Change-Id: I8eb89d0da9966b0a007d4fe31161da9f48f6cd24
CRs-fixed: 424360
Signed-off-by: Venkateshwarlu Domakonda <Venkateshwarlu@codeaurora.org>

Conflicts:
	arch/arm/boot/dts/msm8974.dtsi
	arch/arm/mach-msm/board-8974.c
aries: move iris_fm to devtree