tz-log: add 64bit support for tz-log driver

change tz-log driver to support 64bit kernel and move it to
drivers/firmware/qcom folder.

Change-Id: Ifa3e907bd647a63c51146ef8a9d9e8dfcec0a9e6
Signed-off-by: Zhen Kong <zkong@codeaurora.org>