linux-nilrt: remove misleading comment
linux-nilrt: remove misleading comment

There is no longer any tracing information in the
LINUX_VERSION_EXTENSION.

Signed-off-by: Alex Stewart <04cdb2793e4fb0120cc30d1c823099f3862701f4@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt