ARM: dts: msm: set overlap fudge factor to 1.5 for msm8974

Set the fudge factor for the overlap bandwidth to 1.5.
This fixes underruns observed in some use cases with 8974 target.

CRs-Fixed: 635005
Change-Id: Ib90e654bd5fe1ca07581811eb3d7567d3c587c63
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>