powerpc/85xx: Fix function naming for p1023_rdb platform

p1023_rdb platform is a copy of mpc85xx_rdb platform and some of its
functions have kept mpc85xx_rdb names.

Rename the said functions.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/6cb9865d916231c38401ba34ad1a98c249fae135.1676711562.git.christophe.leroy@csgroup.eu

arch/powerpc/platforms/85xx/p1023_rdb.c

@@ -37,7 +37,7 @@
  * Setup the architecture
  *
  */
-static void __init mpc85xx_rdb_setup_arch(void)
+static void __init p1023_rdb_setup_arch(void)
 {
 	struct device_node *np;
 
@@ -83,7 +83,7 @@ static void __init mpc85xx_rdb_setup_arch(void)
 
 machine_arch_initcall(p1023_rdb, mpc85xx_common_publish_devices);
 
-static void __init mpc85xx_rdb_pic_init(void)
+static void __init p1023_rdb_pic_init(void)
 {
 	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 		MPIC_SINGLE_DEST_CPU,
@@ -97,8 +97,8 @@ static void __init mpc85xx_rdb_pic_init(void)
 define_machine(p1023_rdb) {
 	.name			= "P1023 RDB",
 	.compatible		= "fsl,P1023RDB",
-	.setup_arch		= mpc85xx_rdb_setup_arch,
-	.init_IRQ		= mpc85xx_rdb_pic_init,
+	.setup_arch		= p1023_rdb_setup_arch,
+	.init_IRQ		= p1023_rdb_pic_init,
 	.get_irq		= mpic_get_irq,
 	.calibrate_decr		= generic_calibrate_decr,
 	.progress		= udbg_progress,