util: Add coreboot-configurator

A simple GUI to change settings in coreboot's CBFS, via the nvramtool utility.

Test on the StarBook Mk IV running coreboot 4.15 with:
* Ubuntu 20.04
* Ubuntu 21.10
* MX Linux 21
* elementary OS 6
* Manjaro 21

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I491922bf55ed87c2339897099634a38f8d055876
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59256
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

util/coreboot-configurator/meson_options.txt

@@ -0,0 +1,12 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+option('sizes',
+	type: 'array',
+	choices: ['24', '48', '96', '16', '32', '64', '128', '256', '512'],
+	description: 'Choose icon size(s)',
+)
+
+option('mock',
+	type : 'boolean',
+	value : false
+)