ARM: am335x: Add phyBOARD REGOR support

phyBOARD-REGOR is based on phyCORE AM335x R2 SoM (PCL060).

CPU  : AM335X-GP rev 2.1
Model: Phytec AM335x phyBOARD-REGOR
DRAM:  512 MiB
NAND:  512 MiB
MMC:   OMAP SD/MMC: 0
eth0: ethernet@4a100000

Working:
 - Eth0
 - i2C
 - MMC/SD
 - NAND
 - UART
 - USB (host)

Device trees were taken from Linux mainline:
commit c4d6fe731176 ("Linux 5.9.0")

Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/am335x-regor-rdk.dts b/arch/arm/dts/am335x-regor-rdk.dts
new file mode 100644
index 0000000..66a1360
--- /dev/null
+++ b/arch/arm/dts/am335x-regor-rdk.dts
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Phytec Messtechnik GmbH
+ * Author: Teresa Remmet <t.remmet@phytec.de>
+ *
+ */
+
+/dts-v1/;
+
+#include "am335x-phycore-som.dtsi"
+#include "am335x-regor.dtsi"
+
+/* SoM */
+&gpmc {
+	status = "okay";
+};
+
+&i2c_eeprom {
+	status = "okay";
+};
+
+&serial_flash {
+	status = "okay";
+};