meson: Build the ich_descriptors_tool as feature

Provide the meson option `-Dich_descriptors_tool=auto/enable/disabled`
to determin if the ich_descriptors_tool should be build or not. On
`auto` or `enabled` it will be, on `disabled` it will not be build.
This is usefull for environments where the ich_descriptors_tool is not
needed.

Change-Id: Ief65a914019f72536d563eda36bd7f2f5330bea8
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/66704
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72345
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/meson_options.txt b/meson_options.txt
index d606565..f0ff2be 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -2,6 +2,7 @@
 option('usb', type : 'boolean', value : true, description : 'use libusb1')
 option('default_programmer_name', type : 'string', description : 'default programmer')
 option('default_programmer_args', type : 'string', description : 'default programmer arguments')
+option('ich_descriptors_tool', type : 'feature', value : 'auto', description : 'Build ich_descriptors_tool')
 option('print_wiki', type : 'boolean', value : true,  description : 'Print Wiki')
 
 option('config_atahpt', type : 'boolean', value : false, description : 'Highpoint (HPT) ATA/RAID controllers')