build: meson support for openpower-pel extensions

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4b45f71a3de4966fe3649480d4333806f201f405
diff --git a/meson_options.txt b/meson_options.txt
index de37d35..d27f124 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,4 +1,10 @@
 option('tests', type: 'feature', description: 'Build tests')
+option(
+    'openpower-pel-extension',
+    type: 'feature',
+    description: 'Create PELs',
+    value: 'disabled'
+)
 
 option('yamldir', type: 'string', description: 'Path to YAML')
 option(