CI: remove --mu option

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/oai-ci-vm-tool

@@ -214,7 +214,7 @@ function variant__v7__enb_ethernet {
     VM_MEMORY=4096
     ARCHIVES_LOC=enb_eth
     NB_PATTERN_FILES=9
-    BUILD_OPTIONS="--eNB -w USRP --mu"
+    BUILD_OPTIONS="--eNB -w USRP"
 }
 
 function variant__v8__ue_ethernet {