octeontx2-pf: Add validation in ntuple delete flow

commit be8d2544042b60c71f209bd673aedb81b33e8203 from
git@git.assembla.com:cavium/WindRiver.linux.git

Add proper validation to handle below cases
 *mcam rules are truncated
 *user calls ntuple off without adding any

Change-Id: Ic1ab6b2ac72c7fb33b22b1cecd2fba240bf0743c
Signed-off-by: hariprasad <hkelam@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/14087


Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Kevin Hao <kexin.hao@windriver.com>