staging: wfx: fix messages names in tracepoints

The names of the hardware interface messages are not displayed correctly
in tracepoints. Thus, REQ_JOIN is displayed JOIN_REQ. Fix that in order
to get the names as defined in headers of HIF API.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200427134031.323403-16-Jerome.Pouiller@silabs.com


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