USB: ci13xxx_msm: Disable TXFIFO_IDLE_FORCE bit to prevent corruption

There is a possibility of TX buffer corruption in core (device mode)
if TXFIFO_IDLE_FORCE chicken bit is left enabled. As this bit is not
required with the current core configuration, disable it.

CRs-fixed: 674673
Change-Id: I91c7ca3d02585858bb07c39444a577b3e59fc9c3
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>