meson: disable oe-sdk by default

The meson option oe-sdk is used in rare scenarios.  Having it
non-defaulted turns it into an `auto` feature, which is not desired.
Explicitly disable it by default.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib3f291305e060178d366a42e165085ad15f1d84e
diff --git a/meson.options b/meson.options
index 7cf4e54..4459290 100644
--- a/meson.options
+++ b/meson.options
@@ -42,7 +42,7 @@
     description: 'The sequencer definition file to use.',
 )
 option(
-    'oe-sdk', type: 'feature', description: 'Enable OE SDK'
+    'oe-sdk', type: 'feature', value: 'disabled', description: 'Enable OE SDK'
 )
 option(
     'cold-redundancy', type: 'boolean',