soc: qcom: Add Minidump support

This is snapshot of the Minidump driver as of msm-4.4
'commit 198c5bc3349b ("soc: qcom: minidump: move elf global
variables to structure")'.
This enables minidump feature. It allows various client subsystems to
register respective dump regions. Registered Minidump dump regions
would be collected on system crash.

Change-Id: I14377cfba8703f0acadc29e51e2cf7563616571d
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>