Add MAP x RPM variable to datalog

reference/speeduino.ini

@@ -1610,6 +1610,7 @@ menuDialog = main
    
    boostCutOut      = { boostCutFuel || boostCutSpark }
    lambda           = { afr / stoich } 
+   MAPxRPM          = { rpm * map }
    
 #if EXPANDED_CLT_TEMP
     clt_exp = { 1 }
@@ -1658,6 +1659,7 @@ menuDialog = main
    entry = secl,            "SecL",        int,    "%d"
    entry = rpm,             "RPM",         int,    "%d"
    entry = map,             "MAP",         int,    "%d"
+   entry = MAPxRPM,         "MAPxRPM",     int,    "%d"
    entry = tpsADC,          "tpsADC",      int,    "%d"
    entry = tps,             "TPS",         int,    "%d"
    entry = afr,             "O2",          float,  "%.3f"