drivers: imx: imx_gpt: Add general purpose timer API binding

Add delay timer API so that it can be called by delay timer
layer and used as delay timer globally.

[bod: changed name from imx_delay_timer -> imx_gpt ]

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
diff --git a/drivers/imx/timer/imx_gpt.h b/drivers/imx/timer/imx_gpt.h
new file mode 100644
index 0000000..6416c3c
--- /dev/null
+++ b/drivers/imx/timer/imx_gpt.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __IMX_GPT_H__
+#define __IMX_GPT_H__
+
+#include <stdint.h>
+
+void imx_gpt_ops_init(uintptr_t reg_base);
+
+#endif /* __IMX_GPT_H__ */