riscv: dts: add dts for unmatched rev1

The difference between unmatched rev3 and rev1 is DDR timing, the rev3
uses 1866 MT/s for 16GiB, and rev1 uses 2133 MT/s for 8GiB.

Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index b6e9166..ba69894 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -5,7 +5,7 @@
 dtb-$(CONFIG_TARGET_QEMU_VIRT) += qemu-virt.dtb
 dtb-$(CONFIG_TARGET_OPENPITON_RISCV64) += openpiton-riscv64.dtb
 dtb-$(CONFIG_TARGET_SIFIVE_UNLEASHED) += hifive-unleashed-a00.dtb
-dtb-$(CONFIG_TARGET_SIFIVE_UNMATCHED) += hifive-unmatched-a00.dtb
+dtb-$(CONFIG_TARGET_SIFIVE_UNMATCHED) += hifive-unmatched-a00.dtb hifive-unmatched-a00-rev1.dtb
 dtb-$(CONFIG_TARGET_SIPEED_MAIX) += k210-maix-bit.dtb
 
 targets += $(dtb-y)