net/mlx5: HWS, reduce memory consumption of a matcher struct

net/mlx5: HWS, reduce memory consumption of a matcher struct

Instead of having a large array of action templates allocated with
kmalloc, have smaller array and allocate it with kvmalloc.

The size of the array represents the max number of AT attach
operations for the same matcher. This number is not expected
to be very high. In any case, when the limit is reached, the
next attempt to attach new AT will result in creation of a new
matcher and moving all the rules to this matcher.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Erez Shitrit <erezsh@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250102181415.1477316-9-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>