net: microchip: sparx5: clean up PSFP resources on flower setup failure

sparx5_tc_flower_psfp_setup() allocates PSFP stream gate, flow meter and
stream filter resources before adding VCAP actions. If a later step
fails, the resources allocated earlier in the function are not unwound.

Add error paths to release the stream filter, flow meter and stream gate
when setup fails after they have been acquired.

Also make sparx5_psfp_fm_add() return the acquired flow-meter id before
the existing-flow-meter early return. When an existing flow meter is
reused, sparx5_psfp_fm_get() increments its pool reference count, but the
caller previously kept psfp_fmid as 0. If a later setup step failed, the
error path could try to delete flow-meter id 0 instead of the reused flow
meter, leaving the incremented reference behind.

Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Link: https://patch.msgid.link/20260603061716.747282-1-lihaoxiang@isrc.iscas.ac.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>