sif: Support for EPSC_API_VERSION(2,5)

sif: Support for EPSC_API_VERSION(2,5)

Up-to-date header files for protocol up to and including EPSC API v.2.5:
 * a new query, EPSC_QUERY_HW_REVISION to query HW revision through mailbox
   (from v2.5)
 * Enable Jumbo frame query support (from v2.4)
 * add DEGRADE_CAUSE_FLAG_MCAST_LACK_OF_CREDIT
   adding new cause for degraded mode (from v2.3)
 * adding external portinfo query:
   Adding a query for some portinfo attributes on the external port.
   Only a draft until PSIFFW implementation is done.
   (from v2.2)
 * API for mailbox for BER (BER = Bit Error Rate) support
   (from v2.1)

Signed-off-by: Knut Omang <knut.omang@oracle.com>