Fix up WS2812 SPI driver on F072. (#13022)

keyboards/primekb/meridian/config.h

@@ -36,6 +36,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define RGBLED_NUM 3
 #define WS2812_SPI SPID2
 #define WS2812_SPI_MOSI_PAL_MODE 0
+#define WS2812_SPI_SCK_PAL_MODE 0
+#define WS2812_SPI_SCK_PIN B13
 
 /* Set 0 if debouncing isn't needed */
 #define DEBOUNCE    5