arm/dt: msm_bus: Update the active-only property to Boolean type

Active-only flag is a boolean property that was wrongly set for
being used as an integer. Correct this and update the client code
and documentation.

Change-Id: Ief360581f7d9374b09e7a0ee5628cea352800ab8
Signed-off-by: Gagan Mac <gmac@codeaurora.org>