cxgbe(4): Use firmware commands to get/set filter configuration.

1. Query the firmware for filter mode, mask, and related ingress config
   instead of trying to figure them out from hardware registers.  Read
   configuration from the registers only when the firmware does not
   support this query.

2. Use the firmware to set the filter mode.  This is the correct way to
   do it and is more flexible as well.  The filter mode (and associated
   ingress config) can now be changed any time it is safe to do so.

   The user can specify a subset of a valid mode and the driver will
   enable enough bits to make sure that the mode is maxed out -- that
   is, it is not possible to set another bit without exceeding the
   total width for optional filter fields.  This is a hardware
   requirement that was not enforced by the driver previously.

MFC after:	2 weeks
Sponsored by:	Chelsio Communications

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