Revert "shi: Enable SHI interrupt from CS interrupt"
Revert "shi: Enable SHI interrupt from CS interrupt"

This reverts commit 25f19f5bbd1f557d73c64079de9cd242b8e1f6ed, which was
causing host command issues after sysjump. IBUFSTAT seems to behave
strangely. Additional investigation is required.

BUG=chrome-os-partner:55710,chrome-os-partner:55795
BRANCH=None
TEST=Verify host commands continue to work after sysjump.

Change-Id: Id94a9c4677bcae597b9353e081418e649e823564
Signed-off-by: Shawn Nematbakhsh <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/366173
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec