Update Explorer FW to level CL376902

Pulling from
  https://github.com/open-power/ocmb-explorer-fw/releases/tag/CL376092

Signed-off-by: Dan Crowell <dcrowell@us.ibm.com>
diff --git a/openpower/package/ocmb-explorer-fw/Config.in b/openpower/package/ocmb-explorer-fw/Config.in
index f84251f..73119ec 100644
--- a/openpower/package/ocmb-explorer-fw/Config.in
+++ b/openpower/package/ocmb-explorer-fw/Config.in
@@ -24,7 +24,7 @@
 
 config BR2_OCMB_EXPLORER_FW_VERSION
 	string
-	default "v3.0" if BR2_OCMB_EXPLORER_FW_LATEST_VERSION
+	default "CL376092" if BR2_OCMB_EXPLORER_FW_LATEST_VERSION
 	default BR2_OCMB_EXPLORER_FW_CUSTOM_VERSION_VALUE \
 		if BR2_OCMB_EXPLORER_FW_CUSTOM_VERSION