gpsd: update ubx option for version 3.10

For gpsd 3.10, the ubx scons option has been renamed to ublox. Update our
makefile accordingly.

Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gpsd/gpsd.mk

@@ -147,7 +147,7 @@ ifneq ($(BR2_PACKAGE_GPSD_TRUE_NORTH),y)
 	GPSD_SCONS_OPTS += tnt=no
 endif
 ifneq ($(BR2_PACKAGE_GPSD_UBX),y)
-	GPSD_SCONS_OPTS += ubx=no
+	GPSD_SCONS_OPTS += ublox=no
 endif
 
 # Features