Adding kconfig flag for enabling matrix polling (vs interrupts) on the matrix gpio driver.

app/drivers/zephyr/Kconfig

@@ -9,6 +9,10 @@ config ZMK_KSCAN_GPIO_POLLING
 	bool "Poll for key event triggers instead of using interrupts"
 	default n
 
+config ZMK_KSCAN_GPIO_MATRIX_POLLING
+    bool "Poll for key event triggers instead of using interrupts on matrix boards."
+    default n
+
 endif
 
 config ZMK_KSCAN_INIT_PRIORITY