lttng-modules: Add nios2 support

lttng-modules: Add nios2 support

The lttng-modules are compatible with nios2, so just amend
the compatibility string.

(From OE-Core rev: e219a977a8243c858028c36c41b17fad12413290)

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Ross Burton <ross.burton@intel.com>
Cc: Thomas Chou <thomas@wytron.com.tw>
Cc: Walter Goossens <waltergoossens@home.nl>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>