ARM: dts: msm: Enable USB AHB reset on sdxlemur Rumi

AHB reset was disabled as USB enumeration was failing
on sdxlemur Rumi due to a RTL related issue. The issue is
fixed on RTL version>=E3.9. Hence enable AHB reset as part
of PHY reset on Rumi.

Change-Id: I2838ac4d624f55901a62d5ee74c1ad7b709f1ab8