forked from Mirrors/opensbi

Currently, only hart 1 is enabled for fu540 platform to support U-boot. Introduce a compile time FU540_ENABLED_HART_MASK option so that specific harts can be selected for booting. As fu540 is a multicore, we should boot all cores by default except hart 0. Signed-off-by: Atish Patra <atish.patra@wdc.com>