powerpc/powermac: Use str_enabled_disabled() and str_on_off() helpers

Remove hard-coded strings by using the str_enabled_disabled() and
str_on_off() helper functions.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250117114625.64903-2-thorsten.blum@linux.dev

arch/powerpc/platforms/powermac/setup.c

@@ -45,6 +45,7 @@
 #include <linux/root_dev.h>
 #include <linux/bitops.h>
 #include <linux/suspend.h>
+#include <linux/string_choices.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 
@@ -238,8 +239,7 @@ static void __init l2cr_init(void)
 				_set_L2CR(0);
 				_set_L2CR(*l2cr);
 				pr_info("L2CR overridden (0x%x), backside cache is %s\n",
-					*l2cr, ((*l2cr) & 0x80000000) ?
-					"enabled" : "disabled");
+					*l2cr, str_enabled_disabled((*l2cr) & 0x80000000));
 			}
 			of_node_put(np);
 			break;

arch/powerpc/platforms/powermac/time.c

@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/param.h>
 #include <linux/string.h>
+#include <linux/string_choices.h>
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/time.h>
@@ -77,7 +78,7 @@ long __init pmac_time_init(void)
 		delta |= 0xFF000000UL;
 	dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
 	printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
-		dst ? "on" : "off");
+		str_on_off(dst));
 #endif
 	return delta;
 }