USB: ci13xxx_msm_hsic: Don't overwrite TLMM register

Driver is overriding TLMM configuration register with
the value passed from device-tree. Change this to
rather OR with existing value to preserve reserved bits.

Change-Id: Ifde2a6e1d58166183f54c578354a3b6202162305
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>