common: use l2 cache for sdram
common: use l2 cache for sdram

Signed-off-by: Alessandro Comodi <622632e70fd6771cf2cd943f69e5e51ab66adef8@antmicro.com>

antmicro/litex-rowhammer-tester,antmicro/litex-rowhammer-tester,antmicro/litex-rowhammer-tester