ARM: dts: msm: Remove USB async IRQ from mpq8092-simulator

This change is required as "USB: phy-msm-usb: Enable USB Interrupt only if
ASYNC IRQ is not present" disables usb interrupt as simulator is not
simulating async irq, but it is present in dt.

CRs-fixed: 552123
Change-Id: I6f6e8ec06ba59f5bac939f7ae902c1de5aab4273
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>