board: hpe: gxp: add HPE GXP soc support

Add basic support for the HPE GXP SoC. Reset the EHCI controller at
boot.

Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>
diff --git a/board/hpe/gxp/Kconfig b/board/hpe/gxp/Kconfig
new file mode 100644
index 0000000..5b154a3
--- /dev/null
+++ b/board/hpe/gxp/Kconfig
@@ -0,0 +1,46 @@
+choice
+	prompt "SoC select"
+
+config TARGET_GXP
+	bool "GXP"
+	select DM
+	select SOC_GXP
+	imply CMD_DM
+
+config TARGET_GXP2
+	bool "GXP2"
+	select DM
+	select SOC_GXP
+	select GXP_ECC
+	imply CMD_DM
+
+endchoice
+
+choice
+	prompt "GXP VROM size"
+	default GXP_VROM_64MB
+	optional
+
+config GXP_VROM_64MB
+	bool "64MB"
+
+config GXP_VROM_32MB
+	bool "32MB"
+endchoice
+
+config GXP_ECC
+	bool "Enable memory ECC protected"
+	help
+	  Use half of memory to enable ECC protected
+
+config SYS_BOARD
+	default "gxp"
+
+config SYS_VENDOR
+	default "hpe"
+
+config SYS_CONFIG_NAME
+	default "gxp"
+
+config SYS_TEXT_BASE
+	default 0x50000000