octeontx2-bphy-netdev: Fixed sparse errors

commit 6c8595da26c0f09f6726f132549884d9e923e263 from
git@git.assembla.com:cavium/WindRiver.linux.git

Fixed sparse errors/warnings.
1. incorrect type in argument 1 (different address spaces)
2. cast removes address space '<asn:2>' of expression
3. restricted __be16 degrades to integer
4. cast to restricted __be16

Change-Id: Ib7b6a80b1d59ab6f2dc6b4001c07d78854138b55
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/101411
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Tested-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>