wil6210: add support for multiple sections in brd file

Current board file loading procedure assumes that the board file
includes only one section.
New board files can include multiple sections.
Add the ability to read multiple addresses and max size from FW
file and load multiple sections from the board file into those
addresses.

Change-Id: I91841da252660c16b705756f99939bfbfae118a5
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Git-commit: a7feb56f204fd8bcc9a8d7342097f7b3cf87b50e
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>