dt-bindings: clock: r9a06g032: Add the definition of the watchdog clock

This clock is actually the REF_SYNC_D8 clock.
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@traphandler.com>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220221095032.95054-2-jjhiblot@traphandler.comSigned-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>

include/dt-bindings/clock/r9a06g032-sysctrl.h

@@ -74,6 +74,7 @@
 #define R9A06G032_CLK_DDRPHY_PCLK	81	/* AKA CLK_REF_SYNC_D4 */
 #define R9A06G032_CLK_FW		81	/* AKA CLK_REF_SYNC_D4 */
 #define R9A06G032_CLK_CRYPTO		81	/* AKA CLK_REF_SYNC_D4 */
+#define R9A06G032_CLK_WATCHDOG		82	/* AKA CLK_REF_SYNC_D8 */
 #define R9A06G032_CLK_A7MP		84	/* AKA DIV_CA7 */
 #define R9A06G032_HCLK_CAN0		85
 #define R9A06G032_HCLK_CAN1		86