mips: mscc: luton+ocelot: Remove board config options, do probing

As we are moving to multi-dtb and board detection, remove static board
config options, and introduce board probing instead.

Luton: This add single-binary support for the two MSCC luton-based
reference boards - pcb090 and pcb091. The SoC chip ID is used to
determine the board type.

Ocelot: This add single-binary support for the two MSCC ocelot-based
reference boards - pcb120 and pcb123. The PHY ids on specific ports
are used to determine the board type.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
diff --git a/arch/mips/dts/Makefile b/arch/mips/dts/Makefile
index 647d2bf..b61afe6 100644
--- a/arch/mips/dts/Makefile
+++ b/arch/mips/dts/Makefile
@@ -17,6 +17,8 @@
 dtb-$(CONFIG_BOARD_SAGEM_FAST1704) += sagem,f@st1704.dtb
 dtb-$(CONFIG_BOARD_TPLINK_WDR4300) += tplink_wdr4300.dtb
 dtb-$(CONFIG_TARGET_JZ4780_CI20) += ci20.dtb
+dtb-$(CONFIG_SOC_LUTON) += luton_pcb090.dtb luton_pcb091.dtb
+dtb-$(CONFIG_SOC_OCELOT) += ocelot_pcb120.dtb ocelot_pcb123.dtb
 
 targets += $(dtb-y)