lib: utils/irqchip: Don't check hartid in imsic_update_hartid_table()

The imsic_map_hartid_to_data() already checks hartid before using
so we don't need to check in imsic_update_hartid_table().

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>