Update wake sources for PME generated by controllers

BUG=b:37088992
BRANCH=None
TEST=Verifed that XHCI wake source was identified correctly:
135 | 2017-05-25 15:28:17 | ACPI Enter | S3
136 | 2017-05-25 15:28:26 | ACPI Wake | S3
137 | 2017-05-25 15:28:26 | Wake Source | PME - XHCI | 0

Change-Id: I58334af651508f0e09de5fd1273c2a987603516c
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/516804
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed