Add basic 9-channel BCM output

src/pinning.h

@@ -0,0 +1,12 @@
+#pragma once
+
+// Port A
+#define PIN_LED_R_0             0
+#define PIN_LED_G_0             1
+#define PIN_LED_B_0             2
+#define PIN_LED_R_1             3
+#define PIN_LED_G_1             4
+#define PIN_LED_B_1             5
+#define PIN_LED_R_2             6
+#define PIN_LED_G_2             7
+#define PIN_LED_B_2             9