ARM: dts: msm: Enable otg-disable-reset flag for msm8939

Currently as part of disconnect processing, USB driver does
link and PHY reset before putting USB HW in low power mode.
This HW reset is not required. Hence enable otg-disable-reset
flag to avoid PHY reset.

CRs-Fixed: 689112
Change-Id: I627bf8807c24f0d1b5441bf26940863e0349855b
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>