octeontx2-rm: Add VFME interrupt handler

commit 53d3e9b0c94717cb1fbc669048b19d1948691a51 from
git@git.assembla.com:cavium/WindRiver.linux.git

Added VFME interrupt handling functionality.

Signed-off-by: Yuri Tolstov <ytolstov@marvell.com>
Change-Id: Ib4bbb6b69d7287560fd4f5d0aa77adf43e70233b
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/47783


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>