rockchip: mkimage: Add support for rk3568 SoC

rk3568 is the first SoC which supports idb header v2.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/tools/rkcommon.c b/tools/rkcommon.c
index 1b37ff3..29f2676 100644
--- a/tools/rkcommon.c
+++ b/tools/rkcommon.c
@@ -132,6 +132,7 @@
 	{ "rk3368", "RK33", 0x8000 - 0x1000, false, RK_HEADER_V1 },
 	{ "rk3399", "RK33", 0x30000 - 0x2000, false, RK_HEADER_V1 },
 	{ "rv1108", "RK11", 0x1800, false, RK_HEADER_V1 },
+	{ "rk3568", "RK35", 0x14000 - 0x1000, false, RK_HEADER_V2 },
 };
 
 /**