fsa4480: Resolve euro usb analog headset detect issue after PDR

Euro headset is sometimes detected as headphone post PDR.
This is due to race condition between powering up of PGA
and cross connection detection due to which cross conn
detection is not successful resulting in usb analog headset
being detected as headphone post PDR. Save switch_control
value before PDR and apply same value during fsa reg notifier
after PDR so that euro side does not detect as cross conn
post PDR to resolve issue.

Change-Id: I4af17d83a8e4a55185421b370162d8e7a5d5b91f
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>