mlxsw: pci: Allocate skbs using GFP_KERNEL during initialization

mlxsw: pci: Allocate skbs using GFP_KERNEL during initialization

The driver allocates skbs during initialization and during Rx
processing. Take advantage of the fact that the former happens in
process context and allocate the skbs using GFP_KERNEL to decrease the
probability of allocation failure.

Tested with CONFIG_DEBUG_ATOMIC_SLEEP=y.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/dfa6ed0926e045fe7c14f0894cc0c37fee81bf9d.1697034729.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>