arm: msm: Add support for coresight etr for 32 bit

Add all the changes and files required for turning on
coresight ETR for SDM439 32 bit builds.
Snapshots for etmv4x.h and debugv8.h are taken from
4.9 commit:1b3405b8 .

Change-Id: I1b16180bdd496f87e12c6736b7526c2ecde3502b
Signed-off-by: Shilpa Suresh <sbsure@codeaurora.org>