cnss2: Add meta into as a segment to firmware RAM dump

Since driver is saving multiple firmware RAM dump types into one file,
add a new segment which contains meta info of the dump so that it will
be easy to be parsed by tools.

Change-Id: I42c13d8576eece7824192aefacd58a5ad994662b
Signed-off-by: Yue Ma <yuem@codeaurora.org>