msm: tracing: Add ftrace support for LPM resources

Add trace event support to capture sleep value for
each of the lpm resources l2, pxo, vdd mem and vdd
dig during power collapse.

Change-Id: Ie0d7528ecd5a87631ff584953bfe0bd77043add9
Signed-off-by: Priyanka Mathur <pmathur@codeaurora.org>