USB: phy: Use str_enable_disable-like helpers

Replace ternary (condition ? "enable" : "disable") syntax with helpers
from string_choices.h because:
1. Simple function call with one argument is easier to read. Ternary
operator has three arguments and with wrapping might lead to quite
long code.
2. Is slightly shorter thus also easier to read.
3. It brings uniformity in the text - same string.
4. Allows deduping by the linker, which results in a smaller binary
file.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/phy/phy-fsl-usb.c

···
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/string_choices.h>
 #include <linux/proc_fs.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
···
 	if (!otg->gadget || !otg->gadget->dev.parent)
 		return -ENODEV;
 
-	VDBG("gadget %s\n", on ? "on" : "off");
+	VDBG("gadget %s\n", str_on_off(on));
 	dev = otg->gadget->dev.parent;
 
 	if (on) {

drivers/usb/phy/phy-mv-usb.c

···
 #include <linux/clk.h>
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>
+#include <linux/string_choices.h>
 
 #include <linux/usb.h>
 #include <linux/usb/ch9.h>
···
 	if (!otg->gadget)
 		return;
 
-	dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
+	dev_info(mvotg->phy.dev, "gadget %s\n", str_on_off(on));
 
 	if (on)
 		usb_gadget_vbus_connect(otg->gadget);

drivers/usb/phy/phy-tahvo.c

···
 #include <linux/extcon-provider.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/string_choices.h>
 #include <linux/usb/otg.h>
 #include <linux/mfd/retu.h>
 #include <linux/usb/gadget.h>
···
 			       struct device_attribute *attr, char *buf)
 {
 	struct tahvo_usb *tu = dev_get_drvdata(device);
-	return sprintf(buf, "%s\n", tu->vbus_state ? "on" : "off");
+	return sprintf(buf, "%s\n", str_on_off(tu->vbus_state));
 }
 static DEVICE_ATTR_RO(vbus);