skylake: add global reset cause registers to power state

skylake: add global reset cause registers to power state

Log the global reset causes in the power state structure.
While working in there pack the struct and use width-specific
types as this struct crosses the romstate <-> ramstage boundary.
Lastly, remove hsio version as it wasn't being written or read.

After global reset induced:
PM1_STS:   0000
PM1_EN:    0000
PM1_CNT:   00000000
TCO_STS:   0000 0000
GPE0_STS:  00000000 00000000 00000000 00000000
GPE0_EN:   00000000 00000000 00000000 00000000
GEN_PMCON: d8010200 00003808
GBLRST_CAUSE: 00000000 00040004
Previous Sleep State: S0

BUG=None
BRANCH=None
TEST=Induced global reset on glados using ETR3 register and write
     to cf9.

Change-Id: I97b93de336e74c0e02199241376e74340612f0a7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: bbc8f1d62131c0381e9d401f3281ee7a17fc2a47
Original-Change-Id: I1a8e5d07c6c0e09c163effe27491d8f198823617
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/286640
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/11011
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>