defconfig: sdx-perf: Enable KTM driver for sdx target

Enable kernel thermal monitor driver which monitors
thermal sensors and do appropriate mitigation based on
preset configuration.

Change-Id: I3256ef5f9a12857e4041c6d96efe49a0b3694271
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>