meson: Enable unit tests from x86

Enable running the unit tests from an x86 sdk.

Tested: Raun unit tests with:
        meson -Doe-sdk=enabled -Dtests=enabled build
        ninja -C build test

Change-Id: Ifc05946cbc30d37de89326e9095e98d9a9fdcec5
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/meson_options.txt b/meson_options.txt
index c6a640a..65638ca 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,4 +1,5 @@
 option('tests', type: 'feature', description: 'Build tests.')
+option('oe-sdk', type: 'feature', description: 'Enable OE SDK')
 option('device-type', type: 'combo', choices: ['static', 'ubi', 'mmc'], description: 'Select which device type to support')
 option('vpnor', type: 'feature', description: 'Enable virtual PNOR support')
 option('verify-signature', type: 'feature', description: 'Enable image signature validation')