ath79: add extended AR9344 reset sequence

ath79: add extended AR9344 reset sequence

According to datasheet, on AR9344 the switch and switch analog need to
be reset first before initiating a full reset.

Resetting these systems fixes spurious reset hangs on Atheros AR9344
SoCs.

Link: https://github.com/freifunk-gluon/gluon/issues/2904
Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit 144af32b47be6181f01815762159dff863f4616b)

account for
torvalds/linux/commit/41ccb3a0eb57741eebd72e51e011ef098bb1493d
torvalds/linux/commit/5eddff6add4feebac625f256d2fe292935351ce3
[felix.bau@gmx.de: adjust patch so it applies without commits above]
Signed-off-by: Felix Baumann <felix.bau@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/19759
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>