riscv: Rename Andes cpu and board names

The current ae350-related defconfigs could also
support newer Andes CPU IP, so modify the names of CPU
from ax25 to andesv5, and board name from ax25-ae350 to ae350.

Signed-off-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/board/AndesTech/ae350/MAINTAINERS b/board/AndesTech/ae350/MAINTAINERS
new file mode 100644
index 0000000..ead8e0e
--- /dev/null
+++ b/board/AndesTech/ae350/MAINTAINERS
@@ -0,0 +1,13 @@
+AE350 BOARD
+M:	Rick Chen <rick@andestech.com>
+S:	Maintained
+F:	board/AndesTech/ae350/
+F:	include/configs/ae350.h
+F:	configs/ae350_rv32_defconfig
+F:	configs/ae350_rv64_defconfig
+F:	configs/ae350_rv32_xip_defconfig
+F:	configs/ae350_rv64_xip_defconfig
+F:	configs/ae350_rv32_spl_defconfig
+F:	configs/ae350_rv64_spl_defconfig
+F:	configs/ae350_rv32_spl_xip_defconfig
+F:	configs/ae350_rv64_spl_xip_defconfig