net: mvneta: Use __be16 for l3_proto parameter of mvneta_txq_desc_csum()

The value passed as the l3_proto argument of mvneta_txq_desc_csum()
is __be16. And mvneta_txq_desc_csum uses this parameter as a __be16
value. So use __be16 as the type for the parameter, rather than
type with host byte order.

Flagged by Sparse as:

 .../mvneta.c:1796:25: warning: restricted __be16 degrades to integer
 .../mvneta.c:1979:45: warning: incorrect type in argument 2 (different base types)
 .../mvneta.c:1979:45:    expected int l3_proto
 .../mvneta.c:1979:45:    got restricted __be16 [usertype] l3_proto

No functional change intended.
Flagged by Sparse.

Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Marcin Wojtas <marcin.s.wojtas@gmail.com>
Link: https://patch.msgid.link/20240812-mvneta-be16-v1-1-e1ea12234230@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>