PC-BSD/trueos b5556ccsys/dev/altera/atse if_atse.c if_atse_nexus.c, sys/dts/mips beripad-de4.dts

Convert atse(4) driver for Altera Triple-Speed Ethernet MegaCore to use
xdma(4) interface.

This allows us to switch between Altera mSGDMA or SoftDMA engines used by
atse(4) device.

This also makes atse(4) driver become 25% smaller.

Sponsored by:   DARPA, AFRL
Differential Revision:  https://reviews.freebsd.org/D9618
DeltaFile
+343-839sys/dev/altera/atse/if_atse.c
+8-109sys/dev/altera/atse/if_atse_nexus.c
+16-91sys/dev/altera/atse/if_atse_fdt.c
+16-33sys/dev/altera/atse/if_atsereg.h
+19-18sys/dts/mips/beripad-de4.dts
+7-0sys/mips/conf/BERI_DE4_BASE
+409-1,0906 files

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