Remove RSS bit check for setting RETA

RSS is always enabled, so there shouldn't be a case in which
this is a no-op anyway. Also the check is complicated by the fact
that RSS can be enabled in many ways (with DCB, VMDq, etc.).

src/apps/intel_mp/intel_mp.lua

@@ -644,10 +644,6 @@ function Intel:rss_tab (newtab)
    return current
 end
 function Intel:rss_tab_build ()
-   -- noop if rss is not enabled
-   local b = bits { RSS = self:offset("MRQC", "RSS") }
-   if bit.band(self.r.MRQC(), b) ~= b then return end
-
    local tab = {}
    for i=0,self.max_q-1,1 do
       if band(self.r.ALLRXDCTL[i](), bits { Enable = 25 }) > 0 then