msm: idle-v7: Add support to pass tz flag when core is hotplugged

When a core is hotplugged, trustzone migrates secure SPI to
the core that is online. Pass a flag to TZ indicating if it is
hotplugged or not.

Change-Id: I38d5a1987cdde9c6f3a456b7bb7726289ab0ad81
Signed-off-by: Priyanka Mathur <pmathur@codeaurora.org>