util/sconfig: Add LPC and ESPI buses

Picasso has an LPC and eSPI bridge on the same PCI DEVFN. They can both
be active at the same time. This adds a way to specify which devices
belong on which bus.

i.e.,
device pci 14.3 on  # - D14F3 bridge
	device espi 0 on
		chip ec/google/chromeec
			device pnp 0c09.0 on end
		end
	end
	device lpc 0 on
	end
end

BUG=b:154445472
TEST=Built trembyle and saw static.c contained the espi bus.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I0c2f40813c05680f72e5f30cbb13617e8f994841
---
M src/device/device_const.c
M src/device/device_util.c
M src/include/device/path.h
M util/sconfig/lex.yy.c_shipped
M util/sconfig/main.c
M util/sconfig/sconfig.l
M util/sconfig/sconfig.tab.c_shipped
M util/sconfig/sconfig.tab.h_shipped
M util/sconfig/sconfig.y
9 files changed, 200 insertions(+), 147 deletions(-)