meson, configure: move bdrv whitelists to meson

Use the new support for string option parsing.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson_options.txt b/meson_options.txt
index c8e0a10..4306745 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -21,6 +21,10 @@
 option('audio_drv_list', type: 'array', value: ['default'],
        choices: ['alsa', 'coreaudio', 'default', 'dsound', 'jack', 'oss', 'pa', 'sdl'],
        description: 'Set audio driver list')
+option('block_drv_rw_whitelist', type : 'string', value : '',
+       description: 'set block driver read-write whitelist (by default affects only QEMU, not tools like qemu-img)')
+option('block_drv_ro_whitelist', type : 'string', value : '',
+       description: 'set block driver read-only whitelist (by default affects only QEMU, not tools like qemu-img)')
 option('fuzzing_engine', type : 'string', value : '',
        description: 'fuzzing engine library for OSS-Fuzz')
 option('trace_file', type: 'string', value: 'trace',