fw: Set LED colors

- Set LED color to white when firmware has initialized
- Set LED color to black when changing state to loading
- Set LED color to blue when starting testloadapp
- Update mgmt app allowed digest since testloadapp changed

hw/application_fpga/fw/testloadapp/main.c

@@ -2,6 +2,7 @@
 #include <monocypher/monocypher-ed25519.h>
 #include <stdint.h>
 #include <tkey/debug.h>
+#include <tkey/led.h>
 #include <tkey/lib.h>
 #include <tkey/tk1_mem.h>
 
@@ -161,6 +162,8 @@ int main(void)
 	uint8_t available;
 	uint8_t in = 0;
 
+	led_set(LED_BLUE);
+
 	// Generate a key pair from CDI
 	crypto_ed25519_key_pair(secret_key, pubkey, (uint8_t *)cdi);