riscv: dts: t-head: Add basic device tree for Sipeed Lichee PI 4A board

Only add basic support for CPU, PLIC UART and Timer.

Reviewed-by: Wei Fu <wefu@redhat.com>
Signed-off-by: Yixun Lan <dlan@gentoo.org>
diff --git a/arch/riscv/dts/Makefile b/arch/riscv/dts/Makefile
index d9c050e..f1525cb 100644
--- a/arch/riscv/dts/Makefile
+++ b/arch/riscv/dts/Makefile
@@ -8,6 +8,7 @@
 dtb-$(CONFIG_TARGET_SIFIVE_UNMATCHED) += hifive-unmatched-a00.dtb
 dtb-$(CONFIG_TARGET_SIPEED_MAIX) += k210-maix-bit.dtb
 dtb-$(CONFIG_TARGET_STARFIVE_VISIONFIVE2) += jh7110-starfive-visionfive-2.dtb
+dtb-$(CONFIG_TARGET_TH1520_LPI4A) += th1520-lichee-pi-4a.dtb
 include $(srctree)/scripts/Makefile.dts
 
 targets += $(dtb-y)