FreeBSD/src b39ea98 (r348273)sys/compat/lindebugfs lindebugfs.c, sys/compat/linuxkpi/common/include/linux seq_file.h debugfs.h

MFC r344485:
import linux debugfs support

Reviewed by:    hps@
Sponsored by:   iX Systems
Differential Revision:  https://reviews.freebsd.org/D19258
DeltaFile
+309-0sys/compat/lindebugfs/lindebugfs.c
+157-0sys/compat/linuxkpi/common/src/linux_seq_file.c
+71-0sys/compat/linuxkpi/common/include/linux/seq_file.h
+51-0sys/compat/linuxkpi/common/include/linux/debugfs.h
+588-04 files

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