iwlwifi: change step in so-gf struct

change the step of iwlax210_2ax_cfg_so_jf_a0 to
iwlax210_2ax_cfg_so_jf_b0 as it is on the wcd_fw-dev
repository.

Signed-off-by: ybaruch <yaara.baruch@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210330162204.e9a9d1da76bc.Ie964f37872bbb88d1a02094134f9a2c38faad884@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>