ARM: msm_defconfig: Enable service locator

Enable the kernel client api for the service locator. Since
this feature is needed for internal prototyping, do not
enable it on perf builds for performance reasons.

Change-Id: I713a767efb861541e0b96e36456c6bf420be879d
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>