kern-tools: avoid merge_config concatenation issues

kern-tools: avoid merge_config concatenation issues

Integrating the following kern-tools commit:

    tools/merge_config.sh: add CR after each fragment

    If a fragment file doesn't contain a CR at the end, two config
    options may be merged on the same line in the result file, leading to
    misconfiguration.

    This patch adds a CR after each fragment to ensure that config
    options are well separated in the result file.

    Bug-AGL: SPEC-1475

    Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>
    Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>