ARC: reset: introduce HSDKv1 reset driver

The HSDK v1 periphery IPs can be reset by accessing some registers
from the CGU block.

The list of available reset lines is documented in the DT bindings.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

include/dt-bindings/reset/snps,hsdk-v1-reset.h

@@ -0,0 +1,17 @@
+/**
+ * This header provides index for the HSDK v1 reset controller.
+ */
+#ifndef _DT_BINDINGS_RESET_CONTROLLER_HSDK_V1
+#define _DT_BINDINGS_RESET_CONTROLLER_HSDK_V1
+
+#define HSDK_V1_APB_RESET	0
+#define HSDK_V1_AXI_RESET	1
+#define HSDK_V1_ETH_RESET	2
+#define HSDK_V1_USB_RESET	3
+#define HSDK_V1_SDIO_RESET	4
+#define HSDK_V1_HDMI_RESET	5
+#define HSDK_V1_GFX_RESET	6
+#define HSDK_V1_DMAC_RESET	7
+#define HSDK_V1_EBI_RESET	8
+
+#endif /*_DT_BINDINGS_RESET_CONTROLLER_HSDK_V1*/