soc: marvell: hw_access: get cgx info

commit 2e9de0e2a38a390ec700f814e6d016ccd58ce478 from
git@git.assembla.com:cavium/WindRiver.linux.git

Implementing a new ioctl to get pci func to cgx mapping, also
returning nix index to which respective CGX is attached.

Increasing the register map range to read CSRs of 5 CGXs in case
of 98xx

Change-Id: Icb6464ea7d68940ed2fc6df61793c7fa60630c99
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/55863
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>