factory_installer: Change action E description

Change "Cr50 reset" to "RSU".

BUG=None
TEST=None

Change-Id: Ib3213a9b58dfb335f322e257f80dd1775522c477
Reviewed-on: https://chromium-review.googlesource.com/1736368
Tested-by: Cheng-Han Yang <chenghan@chromium.org>
Commit-Ready: Cheng-Han Yang <chenghan@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Wei-Han Chen <stimim@chromium.org>
diff --git a/factory_install.sh b/factory_install.sh
index 09f3b94..aa9792e 100644
--- a/factory_install.sh
+++ b/factory_install.sh
@@ -989,7 +989,7 @@
   menu_line F "Update TPM Firmware" "Call tpm-firmware-update-factory"
   menu_line U "Update Cr50" \
               "Update Cr50 fw from ROOTFS_PARTITION/${PROD_CR50_PATH}"
-  menu_line E "Reset Cr50" "Perform a Cr50 reset"
+  menu_line E "Reset Cr50" "Perform RSU (RMA Server Unlock)"
   menu_line M "Cr50 factory mode" "Enable Cr50 factory mode"
 
   echo