octeontx2-af: Always allocate low priority entries for PF

commit daa0e939fe2ce7e7ada5534b3d01450d59a4fc09 from
git@git.assembla.com:cavium/WindRiver.linux.git

PF mcam entries has to be at low priority always. This is
taken care currently but when priority allocation wrt reference
entry is requested then entries are allocated from mid-zone
instead of low priority zone. Fix this and always allocate
entries from low priority zone for PFs.

Fixes: 14002d9ac143 ("octeontx2-af: Allocate low priority entries for PF")
Change-Id: I7c4385612ab8458e1cb7a9531069dcbf45bf0b9a
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/115353


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>