[qca-nss-drv]: Add support for retrieving NSS FW logs from HLOS

This commit adds support in qca-nss-drv to retrieve NSS FW logs
from HLOS by running cat/tail command on file
/sys/kernel/debug/qca-nss-drv/logs/core0 (core-id 0) or file
/sys/kernel/debug/qca-nss-drv/logs/core1 (core-id 1). We can
also run 'tail -f <file>'

Change-Id: Id137e0c41e336d683a46354fd50544a8d9364ffa
Signed-off-by: Saurabh Misra <smisra@codeaurora.org>
7 files changed