defconfig: msm8610: Enable USB Monitor

USB host mode is used on MSM8610 for UICC. Enable usbmon for
debugging.

CRs-Fixed: 643115
Change-Id: I0180420d9f6a6cb9297e883fae196e1f2d0bc839
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>