bnxt_en: set missing reload flag in devlink features

Add missing devlink_set_features() API for callbacks reload_down
and reload_up to function.

Fixes: 228ea8c1

 ("bnxt_en: implement devlink dev reload driver_reinit")
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>