common/sfc_efx/base: handle normal events in extended width

common/sfc_efx/base: handle normal events in extended width

Process the encasulated events as for the normal event loop. The phase
bit in the encapsulated event should be ignored, as the polling loop
uses the phase bit from the extended-width event.

Signed-off-by: Andy Moreton <amoreton@xilinx.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>