Makefile is missing show how to usage correct parameters

[leonelhs]

BR-OpenIPC usage:

• make help|usage - print this help
• make install-deps - install system deps
• make prepare - download and unpack buildroot
• make list-configs - show available hardware configs list
• make BOARD=<BOARD-ID> board-info - write to stdout information about selected board
• make BOARD=<BOARD-ID> all - build all needed for a board (toolchain, kernel and rootfs images)
• make overlayed-rootfs-<FS-TYPE> ROOTFS_OVERLAYS=... - create rootfs image that contains original
• make clean - cleaning before reassembly
• make distclean - switching to the factory state Buildroot target dir overlayed by some custom layers. Example: make overlayed-rootfs-squashfs ROOTFS_OVERLAYS=./examples/echo_server/overlay/

wrong command as is shown: make list-configs ls: cannot access '/Users/myuser/openipc/firmware/br-ext-chip-/configs': No such file or directory

command needs set to platform argument to work properly: make list-configs PLATFORM=anyka unknown_unknown_ak3918ev200_openipc_defconfig

make PLATFORM=anyka BOARD=ak3918ev200 all making ....