msm: dts: fsm9900: change the EMAC binding prefix

Change the binding prefix for EMAC from "qcom" to "qti"
for fsm9900 target.

Change-Id: I103399954a4534f0766cca818c7e7213d5455076
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>