powerpc/85xx: mpc85xx_{ds/rdb} replace prink by pr_xxx macro

Use pr_debug() instead of printk(KERN_DEBUG
Use pr_err() instead of printk(KERN_ERR
Use pr_info() instead of printk(KERN_INFO or printk("

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230408140122.25293-5-pali@kernel.org