InCallUI: Fix location of answer ring on incoming call

Previous commit, https://gerrit.paranoidandroid.co/#/c/3931/ changed the location
of the ring and lowered it too far. This commit reverts only the dimens.xml package
to put it back to default location.

Change-Id: I684edf26ca1af94d1884cf8df1c41a72ea41e22e
incallui: fix callbuttons xxhdpi images

Fix addParticipant and modifyCall images to properly fit in xxhdpi resolutions

Change-Id: I9f1ff0517a86a25660295f1302d0d20e2482fd12
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

Conflicts:
	src/com/android/incallui/CallButtonFragment.java