Compare CONFIG_PROVISION_ALL_IN_ONE_OVS_BRIDGE to 'false'

CONFIG_PROVISION_ALL_IN_ONE_OVS_BRIDGE value is changed to 'true' if it
is set o 'y' and set to 'false' when original value was 'n'. But
comparision is still done according 'n'.

Change-Id: I6ed0757b97c36cff380989263043757354c62ad8