irqchip/sifive-plic: Use dev_xyz() in-place of pr_xyz()

Use dev_info(), dev_warn(), and dev_err() in-place of pr_info(),
pr_warn(), and pr_err().

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240222094006.1030709-3-apatel@ventanamicro.com