[Keyboard] Add ERA65 (#19591)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/era/era65/mcuconf.h

@@ -0,0 +1,8 @@
+// Copyright 2022 MatteoDM <matteodalmo@gmail.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+#include_next <mcuconf.h>
+
+/* Used for backlight display */
+#undef RP_PWM_USE_PWM0
+#define RP_PWM_USE_PWM0         TRUE