vboot: remove VBOOT_EC_SLOW_UPDATE Kconfig option

This option has been relocated to depthcharge:
https://crrev.com/c/1524806

BUG=b:124141368, b:124192753
TEST=Build and deploy to eve
TEST=util/lint/checkpatch.pl -g origin/master..HEAD
TEST=util/abuild/abuild -B -e -y -c 50 -p none -x
TEST=make clean && make test-abuild
CQ-DEPEND=CL:1524806
BRANCH=none

Change-Id: Ib4a83af2ba143577a064fc0d72c9bc318db56adc
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31909
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/kahlee/Kconfig b/src/mainboard/google/kahlee/Kconfig
index 921f1be..3398902 100644
--- a/src/mainboard/google/kahlee/Kconfig
+++ b/src/mainboard/google/kahlee/Kconfig
@@ -101,7 +101,6 @@
 config VBOOT
 	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select VBOOT_LID_SWITCH
-	select VBOOT_EC_SLOW_UPDATE if VBOOT_EC_SOFTWARE_SYNC
 
 config VBOOT_VBNV_OFFSET
 	hex
diff --git a/src/mainboard/google/oak/Kconfig b/src/mainboard/google/oak/Kconfig
index 9d6fa0e..b770944 100644
--- a/src/mainboard/google/oak/Kconfig
+++ b/src/mainboard/google/oak/Kconfig
@@ -47,7 +47,6 @@
 
 config VBOOT
 	select EC_GOOGLE_CHROMEEC_SWITCHES
-	select VBOOT_EC_SLOW_UPDATE
 	select VBOOT_VBNV_FLASH
 
 config MAINBOARD_DIR
diff --git a/src/security/vboot/Kconfig b/src/security/vboot/Kconfig
index de0ee6d..004113b 100644
--- a/src/security/vboot/Kconfig
+++ b/src/security/vboot/Kconfig
@@ -200,14 +200,6 @@
 	  firmware similar to how vboot verifies the main system firmware. This
 	  option selects whether vboot should support EC software sync.
 
-config VBOOT_EC_SLOW_UPDATE
-	bool
-	default n
-	depends on VBOOT_EC_SOFTWARE_SYNC
-	help
-	  Whether the EC (or PD) is slow to update and needs to display a
-	  screen that informs the user the update is happening.
-
 config VBOOT_PHYSICAL_DEV_SWITCH
 	bool
 	default n
diff --git a/src/security/vboot/vboot_handoff.c b/src/security/vboot/vboot_handoff.c
index 27d89d0..f009440 100644
--- a/src/security/vboot/vboot_handoff.c
+++ b/src/security/vboot/vboot_handoff.c
@@ -81,11 +81,8 @@
 	/* TODO: Set these in depthcharge */
 	if (!CONFIG(VBOOT_PHYSICAL_DEV_SWITCH))
 		vb_sd->flags |= VBSD_HONOR_VIRT_DEV_SWITCH;
-	if (CONFIG(VBOOT_EC_SOFTWARE_SYNC)) {
+	if (CONFIG(VBOOT_EC_SOFTWARE_SYNC))
 		vb_sd->flags |= VBSD_EC_SOFTWARE_SYNC;
-		if (CONFIG(VBOOT_EC_SLOW_UPDATE))
-			vb_sd->flags |= VBSD_EC_SLOW_UPDATE;
-	}
 	if (!CONFIG(VBOOT_PHYSICAL_REC_SWITCH))
 		vb_sd->flags |= VBSD_BOOT_REC_SWITCH_VIRTUAL;
 	if (CONFIG(VBOOT_OPROM_MATTERS)) {
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 53094b1..75d2d62 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -104,7 +104,6 @@
 	select CHROMEOS_RAMOOPS_DYNAMIC
 
 config VBOOT
-	select VBOOT_EC_SLOW_UPDATE if VBOOT_EC_SOFTWARE_SYNC
 	select VBOOT_SEPARATE_VERSTAGE
 	select VBOOT_OPROM_MATTERS
 	select VBOOT_SAVE_RECOVERY_REASON_ON_REBOOT