chore(epicardium): Move serial into modules

Signed-off-by: Rahix <rahix@rahix.de>

epicardium/main.c

@@ -9,7 +9,7 @@
 #include "pmic.h"
 #include "leds.h"
 #include "api/dispatcher.h"
-#include "serial.h"
+#include "modules/serial.h"
 
 #include "FreeRTOS.h"
 #include "task.h"

epicardium/meson.build

@@ -67,7 +67,6 @@ elf = executable(
   name + '.elf',
   'cdcacm.c',
   'main.c',
-  'serial.c',
   'support.c',
   module_sources,
   dependencies: [libcard10, max32665_startup_core0, maxusb],

epicardium/modules/meson.build

 module_sources = files(
   'leds.c',
+  'serial.c',
 )