bcm6858: add initial support

This add the initial support of the broadcom bcm6858 SoC family,
only the cpu, dram and uart are supported.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f0e7fde..f5d4d39 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -528,6 +528,12 @@
 	imply CMD_DM
 	imply FAT_WRITE
 
+config ARCH_BCM6858
+	bool "Broadcom BCM6858 family"
+	select DM
+	select OF_CONTROL
+	imply CMD_DM
+
 config TARGET_VEXPRESS_CA15_TC2
 	bool "Support vexpress_ca15_tc2"
 	select CPU_V7A
@@ -1490,6 +1496,7 @@
 source "board/armltd/vexpress64/Kconfig"
 source "board/broadcom/bcm23550_w1d/Kconfig"
 source "board/broadcom/bcm28155_ap/Kconfig"
+source "board/broadcom/bcm968580xref/Kconfig"
 source "board/broadcom/bcmcygnus/Kconfig"
 source "board/broadcom/bcmnsp/Kconfig"
 source "board/broadcom/bcmns2/Kconfig"