arm: boot: dts: Fix incorrect IRQ numbers for MSM8996 ADP

The interrupt numbers in the usb3 node of MSM8996 ADP dtsi
file mismatches with the msm8996 SOC dt file. Hence fix by
removing all the hs_phy_irq and pwr_event_irq from usb3 node
in MSM8996 ADP dtsi file.

Add extcon phandle to support extcon based VBUS and ID detection
for MSM8996 Automotive kernel v4.4.
Move the pmic_id_irq to usb_detect label to support ID detection
using extcon framework. The interrupts cell of pmic_id_irq
requires 4 attributes according to the updated interrupt-cells
in spmi_bus node.

Change-Id: I4c77efa923ac1ae4a1f55a6729738e48852c7c15
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>