UPSTREAM: ath10k: refactor firmware crashdump code to coredump.c

In preparation to add RAM dump support. No functional changes, only moving code
and renaming function names.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: f25b9f285a0eff7ae5d987acfb1d2407769b67af
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Change-Id: Ia4dee32d535cd6b08e1b28ab93f0ef9c81442bf9
Signed-off-by: Dundi Raviteja <dundi@codeaurora.org>