serial: sh: Add HSCIF support for R-Car SoC

Provide the basic HSCIF support for R-Car SoC.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Fill in HSSRR offset for Gen2 and SCBRR calculation for Gen2 and Gen3]
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/platform_data/serial_sh.h b/include/dm/platform_data/serial_sh.h
index 69cd012..1a20285 100644
--- a/include/dm/platform_data/serial_sh.h
+++ b/include/dm/platform_data/serial_sh.h
@@ -17,6 +17,7 @@
 	PORT_SCIF,
 	PORT_SCIFA,
 	PORT_SCIFB,
+	PORT_HSCIF,
 };
 
 /*