wil6210: add support for reading multiple RFs temperature via debugfs

Base-band chips support multi RFs chips. Add support for reading
multiple RFs temperature via debugfs.

Change-Id: Iedad126509049ef084c3d04f65a6d7f6347b38ec
Signed-off-by: Tzahi Sabo <stzahi@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: 9b586118730e1b86dc3c8d8523effc712c5a2bfc
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


[merez@codeaurora.org: trivial merge conflicts]
Signed-off-by: Maya Erez <merez@codeaurora.org>