Bug 1387185 - remove --enable-b2g-* options from moz.configure whitelist; r=mshal

These options do not exist in the old configure.

build/moz.configure/old.configure

@@ -159,9 +159,6 @@ def old_configure_options(*options):
     '--enable-accessibility',
     '--enable-address-sanitizer',
     '--enable-alsa',
-    '--enable-b2g-bt',
-    '--enable-b2g-camera',
-    '--enable-b2g-ril',
     '--enable-bundled-fonts',
     '--enable-clang-plugin',
     '--enable-content-sandbox',