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: I51c3d1477cbeea6a88cdee331266d9df188f0024
diff --git a/meson.options b/meson.options
index b11c0fb..9e2339f 100644
--- a/meson.options
+++ b/meson.options
@@ -9,6 +9,7 @@
 option(
     'oe-sdk',
     type: 'feature',
+    value: 'disabled',
     description: 'Enable OE SDK'
 )