staging: wfx: prefix tx_policy_is_equal() with wfx_

tx_policy_is_equal() was the only function from data_tx.c without the
prefix wfx_.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220113085524.1110708-18-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>