octeontx2-af: NIX block LF initialization

Upon receiving NIX_LF_ALLOC mbox message allocate memory for
NIXLF's CQ, SQ, RQ, CINT, QINT and RSS HW contexts and configure
respective base iova HW. Enable caching of contexts into NIX NDC.

Return SQ buffer (SQB) size, this PF/VF MAC address etc info
e.t.c to the mbox msg sender.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>