usb-dbg: add meson option for enabling ME support

Add a meson option called me_support for enabling ME related feature.
Default value is true (enable)

Tested on Bletchley with me_support false

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I7e9f632b53c68b95f1d63f5408a9025f2a20fc3a
diff --git a/meson_options.txt b/meson_options.txt
index 1887aa3..5c9d771 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -8,3 +8,8 @@
   'machine',
   type: 'string',
   description: 'Machine')
+option(
+  'me_support',
+  type : 'boolean',
+  value : true,
+  description: 'Enable ME support')