Prints all x86 signal power state transitions at interrupt level, so
we can see lines toggle more precisely.
BUG=chrome-os-partner:12229
TEST=manual
1. power on system
2. no debug output that looks like [501.001742 x86 in 0x563f]
3. reboot
4. x86indebug 0xffff
5. power on system
6. should see lots of lines that look like [501.001742 x86 in 0x563f]
Change-Id: Ie3b346ee4d4beee3f13ac1245f1eb022b48dabf4
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/29192
Reviewed-by: Bill Richardson <wfrichar@chromium.org>