powerpc/85xx: Replace CONFIG_USB_ISP1760_HCD by CONFIG_USB_ISP1760

Since commit 100832ab ("usb: isp1760: Make HCD support
optional"), CONFIG_USB_ISP1760_HCD is automatically selected when
needed.  Enabling that option in the defconfig is now a no-op, and no
longer enables ISP1760 HCD support.

Re-enable the ISP1760 driver in the defconfig by enabling
USB_ISP1760_HOST_ROLE instead.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Scott Wood <scottwood@freescale.com>

arch/powerpc/configs/85xx/xes_mpc85xx_defconfig

@@ -108,7 +108,7 @@ CONFIG_SENSORS_LM90=y
 CONFIG_WATCHDOG=y
 CONFIG_USB=y
 CONFIG_USB_MON=y
-CONFIG_USB_ISP1760_HCD=y
+CONFIG_USB_ISP1760=y
 CONFIG_USB_STORAGE=y
 CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y