[bsp][renesas] add a DAC entry for ra6m3-hmi-board

bsp/renesas/ra6m3-hmi-board/board/Kconfig

@@ -522,6 +522,16 @@ menu "Hardware Drivers Config"
                 default n
         endif
 
+        menuconfig BSP_USING_DAC
+	        bool "Enable DAC"
+	        default n
+	        select RT_USING_DAC
+	        if BSP_USING_DAC
+	            config BSP_USING_DAC0
+	                bool "Enable DAC0"
+	                default n
+	        endif
+
         menuconfig BSP_USING_FS
             bool "Enable filesystem"
             default n