This is a feature provided to run 32-bit linux binaries on FreeBSD 64bit
machine, for which 32bit compatibilty code has been added.
As in linux there is only one device entry that is used to fire IOCTL commands,
a new device entry megaraid_sas_ioctl_node is added for solely this
purpose.

From one dev node i.e mrgaraid_sa_ioctl_node we have to find out the
controller instance in case of multicontroller, for which one management info
structure has been added.

Reviewed by:	ambrisko
MFC after:		2 weeks
Sponsored by:	AVAGO Technologies


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272737 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f