forked from Mirrors/opensbi

At present fdt_plic_fixup() accepts a 'compat' parameter for PLIC compatible string. In preparation to support the new DT bindings, drop this and use "riscv,plic0" directly in fdt_plic_fixup(). Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>