msm: msm_bus: Correct the number of slave ports in the system

Incorrect number of slave ports in the 8660 fabric definition
was causing a bad memory access. Fix that by correcting the
number of slaves.

Change-Id: I70d7fdb808f32faa0f1ba97a1d6d6c76a13a769e
CRs-Fixed: 312821
Signed-off-by: Gagan Mac <gmac@codeaurora.org>