KVM: arm64: vgic-v3: Use kstrtobool() instead of strtobool()

strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.

In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.

While at it, include the corresponding header file (<linux/kstrtox.h>)

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/f546e636c6d2bbcc0d8c4191ab98ce892fce4584.1673702763.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

arch/arm64/kvm/vgic/vgic-v3.c

@@ -3,6 +3,7 @@
 #include <linux/irqchip/arm-gic-v3.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
+#include <linux/kstrtox.h>
 #include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <kvm/arm_vgic.h>
@@ -587,25 +588,25 @@ DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap);
 
 static int __init early_group0_trap_cfg(char *buf)
 {
-	return strtobool(buf, &group0_trap);
+	return kstrtobool(buf, &group0_trap);
 }
 early_param("kvm-arm.vgic_v3_group0_trap", early_group0_trap_cfg);
 
 static int __init early_group1_trap_cfg(char *buf)
 {
-	return strtobool(buf, &group1_trap);
+	return kstrtobool(buf, &group1_trap);
 }
 early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg);
 
 static int __init early_common_trap_cfg(char *buf)
 {
-	return strtobool(buf, &common_trap);
+	return kstrtobool(buf, &common_trap);
 }
 early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);
 
 static int __init early_gicv4_enable(char *buf)
 {
-	return strtobool(buf, &gicv4_enable);
+	return kstrtobool(buf, &gicv4_enable);
 }
 early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);