wireless/ieee802154/libmac:  Finishes all defined MAC IOCTL helpers (thre are a few that are not defined).

Move apps/include/ieee802154/ieee802154.h to apps/include/wireless/ieee802154.  Add file that I forgot to add in last commit.

wireless/ieee802154: Starts framing out iwpan tool, similar in concept to wapi

Approved-by: Gregory Nutt <gnutt@nuttx.org>

NSH library: Fix open flags in nsh_codeccmd.c

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Jira: PDFW15IS-2824
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

wireless/wapi:  Remove functionality that depends on the Linux procfs:  This includes only 1) listing of available interfaces and 2) listing of all routes.

apps/wireless/wapi:  Fix problems in build support.  Fix some initial compile isses (still does not compile).