soc: marvell: hw_access: add hw context reading support

commit 344d1bcc493231183375b8041af4c8ace53f8a11 from
git@git.assembla.com:cavium/WindRiver.linux.git

Enhancing the capability of csr_access driver to get the
(RQ/SQ/CQ/AURA/POOL) context by sending a request to admin
queue. Adding a new IOCTL which the user will use to get
the required context.

Change-Id: I2b231a26457e62acb9e6b61e8bfd54c78317fffc
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/55862
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>