Remove CONFIG_SYS_BOOTM_LEN from all riscv defconfigs where the new default value is used. Signed-off-by: Martin Herren <sputnik@on-the-web.ch> Acked-by: Michal Simek <michal.simek@amd.com> # xilinx_mbv Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>