soc/intel/{skl,cnl}: Guard USB macro parameters

Add parentheses around the parameter of the `USB_PORT_WAKE_ENABLE`
macro to prevent unintentional operator precedence problems.

Change-Id: I61fbacc129cbfb42ade7e64ee40cd07c98d87683
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>

src/soc/intel/cannonlake/include/soc/usb.h

@@ -191,6 +191,6 @@ struct usb3_port_config {
  * to Port 1, Bit n corresponds to Port (n+1). This bitmap is later used to
  * decide what ports need to set PORTSCN/PORTSCXUSB3 register bits.
  */
-#define USB_PORT_WAKE_ENABLE(x)		(1 << (x - 1))
+#define USB_PORT_WAKE_ENABLE(x)		(1 << ((x) - 1))
 
 #endif

src/soc/intel/skylake/include/soc/usb.h

@@ -185,6 +185,6 @@ struct usb3_port_config {
  * to Port 1, Bit n corresponds to Port (n+1). This bitmap is later used to
  * decide what ports need to set PORTSCN/PORTSCXUSB3 register bits.
  */
-#define USB_PORT_WAKE_ENABLE(x)		(1 << (x - 1))
+#define USB_PORT_WAKE_ENABLE(x)		(1 << ((x) - 1))
 
 #endif