forked from Mirrors/opensbi

The clint_ipi_sync() was removed long time back hence we remove redundant declaration from clint.h Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>