arm: bcmbca: remove bcm6858 support under CONFIG_ARCH_BCM6858

Now that BCM6858 is supported under CONFIG_ARCH_BCMBCA and
CONFIG_BCM6858, remove the original ARCH_BCM6858 support and migrate its
configuration and dts settings. This includes:
- Remove the bcm968580xref board folder. It is replaced by the generic
bcmbca board folder.
- Update bcm968580xref board dts with the new compatible string.
- Delete broadcom_bcm968580xref.h and merge its setting to the new
bcm96858.h file.
- Remove bcm968580xref_ram_defconfig as a basic config version of
bcm96858_defconfig is now added.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b6548c5..3b8c7b3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -685,12 +685,6 @@
 	select OF_CONTROL
 	imply CMD_DM
 
-config ARCH_BCM6858
-	bool "Broadcom BCM6858 family"
-	select DM
-	select OF_CONTROL
-	imply CMD_DM
-
 config ARCH_BCMSTB
 	bool "Broadcom BCM7XXX family"
 	select CPU_V7A
@@ -2325,7 +2319,6 @@
 source "board/armltd/vexpress64/Kconfig"
 source "board/cortina/presidio-asic/Kconfig"
 source "board/broadcom/bcm96753ref/Kconfig"
-source "board/broadcom/bcm968580xref/Kconfig"
 source "board/broadcom/bcmns3/Kconfig"
 source "board/cavium/thunderx/Kconfig"
 source "board/eets/pdu001/Kconfig"
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 37659cb..546a460 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -1167,9 +1167,6 @@
 dtb-$(CONFIG_ARCH_BCM6753) += \
 	bcm96753ref.dtb
 
-dtb-$(CONFIG_ARCH_BCM6858) += \
-	bcm968580xref.dtb
-
 dtb-$(CONFIG_TARGET_BCMNS3) += ns3-board.dtb
 
 dtb-$(CONFIG_ARCH_BCMSTB) += bcm7xxx.dtb
@@ -1200,7 +1197,8 @@
 	bcm96856.dtb \
 	bcm968360bg.dtb
 dtb-$(CONFIG_BCM6858) += \
-	bcm96858.dtb
+	bcm96858.dtb \
+	bcm968580xref.dtb
 dtb-$(CONFIG_BCM6878) += \
 	bcm96878.dtb
 
diff --git a/arch/arm/dts/bcm968580xref.dts b/arch/arm/dts/bcm968580xref.dts
index a034e38..6d787bd 100644
--- a/arch/arm/dts/bcm968580xref.dts
+++ b/arch/arm/dts/bcm968580xref.dts
@@ -8,8 +8,8 @@
 #include "bcm6858.dtsi"
 
 / {
-	model = "Broadcom bcm68580xref";
-	compatible = "broadcom,bcm68580xref", "brcm,bcm6858";
+	model = "Broadcom BCM968580xref Reference Board";
+	compatible = "brcm,bcm968580xref", "brcm,bcm6858", "brcm,bcmbca";
 
 	aliases {
 		serial0 = &uart0;