mediatek: mt8192: add GIC600 support

1. Implement GIC600 driver support and init
2. Remove unused debug info

Change-Id: I30c08c531e705debc029071e4e970048e261c386
diff --git a/plat/mediatek/mt8192/include/mt_gic_v3.h b/plat/mediatek/mt8192/include/mt_gic_v3.h
new file mode 100644
index 0000000..34ba8a7
--- /dev/null
+++ b/plat/mediatek/mt8192/include/mt_gic_v3.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2020, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MT_GIC_V3_H
+#define MT_GIC_V3_H
+
+#include <drivers/arm/gicv3.h>
+#include <lib/mmio.h>
+
+void mt_gic_driver_init(void);
+void mt_gic_init(void);
+void mt_gic_set_pending(uint32_t irq);
+void mt_gic_distif_save(void);
+void mt_gic_distif_restore(void);
+void mt_gic_rdistif_init(void);
+void mt_gic_rdistif_save(void);
+void mt_gic_rdistif_restore(void);
+void mt_gic_rdistif_restore_all(void);
+void gic_sgi_save_all(void);
+void gic_sgi_restore_all(void);
+#endif /* MT_GIC_V3_H */