UPSTREAM: ath10k: check power save support in STA mode through FW IE

Currently ath10k host enables power save support in station mode by
default for all firmwares but Power save for station mode still not supported
in some of the firmware versions. Which results in firmware crash while
issueing multiple scan commands.

Fix this problem by introducing new FW feature flag to check power save
support in firmware and then the firmware image can tell to ath10k that power
save mode is not supported in station mode.

Signed-off-by: Venkateswara Naralasetty <vnaralas@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 36d9cdb6fb4a8b97af51bdd74683dd3e46b97b20
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Change-Id: Ia60d5e75d86d47d1a3f38135f2f26d6f87e2b426
Signed-off-by: Dundi Raviteja <dundi@codeaurora.org>