Remove always_hybrid spec

With always_hybrid also the lx_hybrid_x86 platform in
tool/create_builddir vanishes.

Fixes #1619

tool/autopilot

@@ -309,11 +309,6 @@ foreach platform $platforms {
 	if {[info exists ::env(RUN_OPT_AUTOPILOT)]} {
 		set kernel [exec echo $platform |& sed {s/_.*//}]
 
-		# lx_hybrid is a special case, it also uses boot_dir/linux
-		if {[string equal $kernel "lx"]} {
-			set kernel linux
-		}
-
 		exec echo "RUN_OPT=--include boot_dir/$kernel $::env(RUN_OPT_AUTOPILOT)" >> $build_conf
 	}
 }