KVM: arm64: Replace ternary flags with str_on_off() helper

Replace repetitive ternary expressions with the str_on_off() helper
function. This change improves code readability and ensures consistency
in tracepoint string formatting

Signed-off-by: Seongsu Park <sgsu.park@samsung.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1891546521.01744691102904.JavaMail.epsvc@epcpadp1new
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: Seongsu Park

arch/arm64/kvm/trace_arm.h

@@ -176,7 +176,7 @@ TRACE_EVENT(kvm_set_way_flush,
 	    ),
 
 	    TP_printk("S/W flush at 0x%016lx (cache %s)",
-		      __entry->vcpu_pc, __entry->cache ? "on" : "off")
+		      __entry->vcpu_pc, str_on_off(__entry->cache))
 );
 
 TRACE_EVENT(kvm_toggle_cache,
@@ -196,8 +196,8 @@ TRACE_EVENT(kvm_toggle_cache,
 	    ),
 
 	    TP_printk("VM op at 0x%016lx (cache was %s, now %s)",
-		      __entry->vcpu_pc, __entry->was ? "on" : "off",
-		      __entry->now ? "on" : "off")
+		      __entry->vcpu_pc, str_on_off(__entry->was),
+		      str_on_off(__entry->now))
 );
 
 /*