Expose get_lid_switch() in romstage

The function was used locally and in ramstage to set some
coreboot tables. It's also needed in romstage to deal with
"lid closed" behaviour.

BRANCH=none
BUG=chromium:446945
TEST=none

Change-Id: I8ad7061328c45803699321aa9f5edb0ed2288a8d
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 78281a104fb9d79696a6ceb2a9a89a391146a424
Original-Change-Id: I56314b9dc9062dd61671982e7ec0ff15d7eb1bae
Original-Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/273609
Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Original-Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Queue: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10691
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/bootmode.h

@@ -27,6 +27,7 @@ int get_developer_mode_switch(void);
 int get_recovery_mode_switch(void);
 int clear_recovery_mode_switch(void);
 int get_wipeout_mode_switch(void);
+int get_lid_switch(void);
 
 
 int gfx_get_init_done(void);