target: msm8996: Add USB secondary port support for SBC8096

In SBC8096,USB secondary Port will be used for fastboot use cases,
We need to configure the right PHY for
successful USB enumeration.
Add secondary Port interrupt, secondary port support in qusb2 PHY,
in USB LK driver and in the init sequence.

Change-Id: Ia91d63608732fbe18d00ffc996214cec925acdce
diff --git a/platform/msm8996/platform.c b/platform/msm8996/platform.c
index 1234eda..a3c2d3e 100644
--- a/platform/msm8996/platform.c
+++ b/platform/msm8996/platform.c
@@ -217,3 +217,10 @@
 		return	GCC_QUSB2_PRIM_PHY_BCR;
 }
 
+int usb_irq()
+{
+	if (board_hardware_id() == HW_PLATFORM_SBC)
+		return	USB20_IRQ;
+	else
+		return	USB30_IRQ;
+}