uniphier: support Socionext UniPhier platform

Initial commit for Socionext UniPhier SoC support.  BL1, Bl2, and
BL31 are supported.  Refer to docs/plat/socionext-uniphier.md for
more detais.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/socionext/uniphier/uniphier_syscnt.c b/plat/socionext/uniphier/uniphier_syscnt.c
new file mode 100644
index 0000000..d7bcaf8
--- /dev/null
+++ b/plat/socionext/uniphier/uniphier_syscnt.c
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <platform.h>
+
+unsigned int plat_get_syscnt_freq2(void)
+{
+	return 50000000;
+}