platform: kendryte/k210: Use new mechanism of builtin DTB

We update kendryte/k210 to use new mechanism of having builtin DTB
where we convert k210.dts to C source and further compile-n-link it
with libplatsbi.a.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

platform/kendryte/k210/config.mk

@@ -17,4 +17,3 @@ platform-ldflags-y =
 FW_TEXT_START=0x80000000
 FW_PAYLOAD=y
 FW_PAYLOAD_ALIGN=0x1000
-FW_PAYLOAD_FDT=k210.dtb

platform/kendryte/k210/objects.mk

@@ -8,4 +8,6 @@
 #
 
 platform-objs-y += platform.o
-platform-dtb-y += k210.dtb
+
+platform-objs-y += k210.o
+platform-varprefix-k210.o = dt_k210

platform/kendryte/k210/platform.c

@@ -17,6 +17,15 @@
 #include <sbi_utils/sys/clint.h>
 #include "platform.h"
 
+extern const char dt_k210_start[];
+
+unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1,
+				unsigned long arg2, unsigned long arg3,
+				unsigned long arg4)
+{
+	return (unsigned long)&dt_k210_start[0];
+}
+
 static struct plic_data plic = {
 	.addr = K210_PLIC_BASE_ADDR,
 	.num_src = K210_PLIC_NUM_SOURCES,