WLC: include the wireless FCM correctly

Change the setting of DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE from ':='
to '+=' due to that vendor services like WLC will be added before it.

Bug: 265476345
Change-Id: I1b60f69465faad3749f1e54a561d1c20c99b7237
Signed-off-by: Ken Yang <yangken@google.com>
1 file changed