Revert "Various tweaks to wfd"

This reverts commit 90a92053219ae50ddf4bb54e3d54db2d309e2b8d.

Conflicts:
	media/libstagefright/wifi-display/source/Sender.h

Change-Id: I81c960ed7d2172e0a8958b770d238c7bdbb457f3
Revert "WifiDisplay: Add an HDCP toggle"

This reverts commit 90d6cf79ae229671d3ef735a94d6e215e1a37c5e.
Revert "WFD use of HDCP is now optional."

This reverts commit 0328ec08dc1e90caa2a9e0c4e107d8ddaa74af20.
Revert "Switch audio mode based on dongle's capabilities"

This reverts commit d243c04534d1b74bd66625c5c96a9b918d8838bf.
Revert "Optionally emit LPCM audio instead of using AAC in wifi display code"

This reverts commit e7bd24af08ef0722fb124a550662bcec48c56f86.