defconfig: 8660: enable timechart support

Enable defconfig option required for timechart.
When this tool is not in use, this option does not cause
any statistically significant overhead.

Change-Id: I349e6c43daf444bbb9568cc9a6dcc37d018ad9d7
Signed-off-by: Neil Leeder <nleeder@codeaurora.org>