Retrieve FW version from IMG_BUILTIN_DIR

Added method to retrieve firmware level found in IMG_BUILTIN_DIR. This
is required behavior on some systems types.

Tested:
  Installed openbmc image on system and verified the function returns
  the version available in IMG_BUILT_DIR.

Change-Id: I10166a1412fb9de421bd304c40916a81c1ca0558
Signed-off-by: Faisal Awada <faisal@us.ibm.com>
diff --git a/meson.build b/meson.build
index a1e05d3..b575366 100644
--- a/meson.build
+++ b/meson.build
@@ -43,6 +43,8 @@
 cdata.set_quoted('IMG_DIR_PERSIST', get_option('IMG_DIR_PERSIST'))
 cdata.set_quoted('IMG_DIR_BUILTIN', get_option('IMG_DIR_BUILTIN'))
 
+cdata.set10('ALWAYS_USE_BUILTIN_IMG_DIR', get_option('ALWAYS_USE_BUILTIN_IMG_DIR'))
+
 phosphor_dbus_interfaces = dependency('phosphor-dbus-interfaces')
 phosphor_logging = dependency('phosphor-logging')
 sdbusplus = dependency('sdbusplus')