mb/google/rex: Require VBOOT_LID_SWITCH for Chromebook design

This patch ensures that platforms with lids, such as Chromebooks, only
select the VBOOT_LID_SWITCH configuration option.

Only samples the LID GPIO if VBOOT_LID_SWITCH config is enabled,
otherwise fake LID is open to avoid shutdown after reaching
depthcharge.

Tested by building and booting Google/Rex with the VBOOT_LID_SWITCH
configuration option enabled, and verifying that google/ovis does not
required VBOOT_LID_SWITCH config.

Change-Id: Ic5123b822a5a7021023319cb08a3f9e5225961ba
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77693
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/rex/Kconfig

@@ -160,7 +160,7 @@ config MEMORY_SOLDERDOWN
 	select HAVE_SPD_IN_CBFS
 
 config VBOOT
-	select VBOOT_LID_SWITCH
+	select VBOOT_LID_SWITCH if BOARD_GOOGLE_BASEBOARD_REX
 
 config UART_FOR_CONSOLE
 	int

src/mainboard/google/rex/chromeos.c

@@ -9,7 +9,12 @@
 void fill_lb_gpios(struct lb_gpios *gpios)
 {
 	struct lb_gpio chromeos_gpios[] = {
+#if CONFIG(VBOOT_LID_SWITCH)
 		{-1, ACTIVE_HIGH, get_lid_switch(), "lid"},
+#else
+		/* fake LID open to avoid shutdown in depthcharge */
+		{-1, ACTIVE_HIGH, 1, "lid"},
+#endif
 		{-1, ACTIVE_HIGH, 0, "power"},
 		{-1, ACTIVE_HIGH, gfx_get_init_done(), "oprom"},
 		{-1, ACTIVE_HIGH, 0, "EC in RW"},