cr50 suite: add the servo dependency to tests that need it

firmware_Cr50USB, firmware_Cr50Update, firmware_UpdateScriptStress, and
firmware_FWMPDisableCCD all use servo, but none of their control files
had the servo dependency. This change adds the dependency so the tests
can be run in the lab

BUG=b:35647854
BRANCH=none
TEST=run tests in the lab

Change-Id: I479d7c902cbadc339499345b124d8125f5b7c7a5
Reviewed-on: https://chromium-review.googlesource.com/524285
Reviewed-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Tyler Reid <twreid@google.com>
Commit-Queue: Mary Ruthven <mruthven@chromium.org>
Tested-by: Mary Ruthven <mruthven@chromium.org>
diff --git a/server/site_tests/firmware_Cr50USB/control b/server/site_tests/firmware_Cr50USB/control
index 899420a..dc56df8 100644
--- a/server/site_tests/firmware_Cr50USB/control
+++ b/server/site_tests/firmware_Cr50USB/control
@@ -10,6 +10,7 @@
 ATTRIBUTES = "suite:cr50_stress_experimental"
 TIME = "MEDIUM"
 TEST_TYPE = "server"
+DEPENDENCIES = "servo"
 
 DOC = """
 This test runs 'usb_updater -f' many times to verify the cr50 to ap usb
diff --git a/server/site_tests/firmware_Cr50Update/control b/server/site_tests/firmware_Cr50Update/control
index 6761e8f..fb95cae 100644
--- a/server/site_tests/firmware_Cr50Update/control
+++ b/server/site_tests/firmware_Cr50Update/control
@@ -7,6 +7,7 @@
 PURPOSE = "Verify Cr50 update"
 TIME = "SHORT"
 TEST_TYPE = "server"
+DEPENDENCIES = "servo"
 
 DOC = """
 This test verifies Cr50 update works or recovery from erased nvmem.
diff --git a/server/site_tests/firmware_Cr50UpdateScriptStress/control b/server/site_tests/firmware_Cr50UpdateScriptStress/control
index 2462510..8a12b04 100644
--- a/server/site_tests/firmware_Cr50UpdateScriptStress/control
+++ b/server/site_tests/firmware_Cr50UpdateScriptStress/control
@@ -10,6 +10,7 @@
 ATTRIBUTES = "suite:cr50_stress_experimental"
 TIME = "LONG"
 TEST_TYPE = "server"
+DEPENDENCIES = "servo"
 
 DOC = """
 This test clears the cr50 update state and reboots the device many times
diff --git a/server/site_tests/firmware_FWMPDisableCCD/control b/server/site_tests/firmware_FWMPDisableCCD/control
index 6ab8740..62124a4 100644
--- a/server/site_tests/firmware_FWMPDisableCCD/control
+++ b/server/site_tests/firmware_FWMPDisableCCD/control
@@ -10,6 +10,7 @@
 TIME = "MEDIUM"
 ATTRIBUTES = "suite:cr50_stress_experimental"
 TEST_TYPE = "server"
+DEPENDENCIES = "servo"
 
 DOC = """
 This test will set FWMP flags. If the test has access to the cr50 console, it