powerpc/85xx: Remove DBG() macro

DBG() macro is defined at three places while used only
one time at one place.

Replace its only use by a pr_debug() and remove the macro.
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/20230408140122.25293-2-pali@kernel.org

arch/powerpc/platforms/85xx/mpc85xx_ds.c

@@ -34,14 +34,6 @@
 
 #include "mpc85xx.h"
 
-#undef DEBUG
-
-#ifdef DEBUG
-#define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
-#else
-#define DBG(fmt, args...)
-#endif
-
 #ifdef CONFIG_PPC_I8259
 static void mpc85xx_8259_cascade(struct irq_desc *desc)
 {
@@ -98,7 +90,7 @@ void __init mpc85xx_ds_pic_init(void)
 		return;
 	}
 
-	DBG("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
+	pr_debug("mpc85xxds: cascade mapped to irq %d\n", cascade_irq);
 
 	i8259_init(cascade_node, 0);
 	of_node_put(cascade_node);

arch/powerpc/platforms/85xx/mpc85xx_mds.c

@@ -49,13 +49,6 @@
 
 #include "mpc85xx.h"
 
-#undef DEBUG
-#ifdef DEBUG
-#define DBG(fmt...) udbg_printf(fmt)
-#else
-#define DBG(fmt...)
-#endif
-
 #if IS_BUILTIN(CONFIG_PHYLIB)
 
 #define MV88E1111_SCR	0x10

arch/powerpc/platforms/85xx/mpc85xx_rdb.c

@@ -29,15 +29,6 @@
 
 #include "mpc85xx.h"
 
-#undef DEBUG
-
-#ifdef DEBUG
-#define DBG(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
-#else
-#define DBG(fmt, args...)
-#endif
-
-
 void __init mpc85xx_rdb_pic_init(void)
 {
 	struct mpic *mpic;