ARM: dts: msm: Fix the bus vector names for EMAC in sdxpoorwills

Fix the name for zero bandwidth index in bus vector.

Change-Id: I8c252d0568119e8fa75b16022b663a8a06eb64d0
CRs-Fixed: 2241827
Acked-by: Rahul Kawadgave <rahulak@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>