build: Add the BSP family to the enable set

This makes it possible to use the BSP family in expressions of the enabled-by
attribute.

wscript

@@ -1387,7 +1387,12 @@ def configure_variant(conf, cp, bsp_map, path_list, top_group, variant):
 
     # For the enabled-by evaluation we have to use the base BSP defined by the
     # build specification and not the BSP name provided by the user.
-    conf.env["ENABLE"] = [get_compiler(conf, cp, variant), arch, arch_bsp]
+    conf.env["ENABLE"] = [
+        get_compiler(conf, cp, variant),
+        arch,
+        arch_family,
+        arch_bsp,
+    ]
 
     conf.env["TOP"] = conf.path.abspath()
     conf.env["TOPGROUP"] = top_group