pci: msm: Update NTN3 de-emphasis values via I2C

Change is to update the de-emphasis value of NTN3
via i2c register writes to resolve link failure
issues seen on MBB platforms.

Change-Id: If90e5efc19691a14c3d5f12af78df9ff5c2b2a25
Signed-off-by: Subramanian Ananthanarayanan <skananth@codeaurora.org>