MFC 302440,304873,305704,305985,306787,307531: Fixes for sysctls.

302440:
cxgbe(4): Add sysctl to display the RSS indirection table size for an
interface.

dev.cxl.<n>.rss_size
dev.vcxl.<n>.rss_size

304873:
cxgbe(4): Provide more details about the card in the sysctl MIB.

dev.t5nex.0.%desc: Chelsio T580-CR
dev.t5nex.0.hw_revision: 1
dev.t5nex.0.sn: PT13140042
dev.t5nex.0.pn: 110117150A0
dev.t5nex.0.ec: 0000000000000000
dev.t5nex.0.na: 0007432AF490
dev.t5nex.0.vpd_version: 3
dev.t5nex.0.scfg_version: 53255
dev.t5nex.0.bs_version: 1.1.0.0
dev.t5nex.0.er_version: 1.0.0.68
dev.t5nex.0.tp_version: 0.1.4.9
dev.t5nex.0.firmware_version: 1.16.2.0

305704:
cxgbe(4): Rename the debug_flags driver tunable/sysctl to dflags.
Tunables that end with _flags are special.

305985:
cxgbe(4): Fixes to wrq stats.

• Increment tx_wrs_copied in the correct place.
• Add tx_wrs_sspace to the sysctl MIB.

306787:
cxgbe(4): Fix whitespace in the pm_stats display.

307531:
cxgbe(4): Adjust whitespace to line up the column titles in cim_qcfg
with the values displayed.

Sponsored by: Chelsio Communications