Camera2: fix white balance still work when turn on the HDR mode

Tested on target : 8916
Tested on Branch : kk
Tested on AU \ tip : AU_LINUX_ANDROID_LNX.LA.3.7.1.04.04.03.031.203
Test case Verified : Yes
CR Moved to Fix : Yes
R notes filled : Yes
DC set : Yes
LOST approved (if new file \ feature added): Yes
Voted on required Trunk : NA

App need clear the whitebalance effect when set scene mode not auto, but
the value getWhiteBalance still is not auto when change scene mode.

So set white balance auto value forcely when scene mode is not auto.

CRs-Fixed: 685240

Change-Id: Ib94b9cb1f3cc0c8ef63412ef75d65359ba797f37