msm: kgsl: Return ENOENT from adreno_llc_getd() stub

Return ENOENT error from adreno_llc_getd() stub in
case CONFIG_QCOM_LLCC is not defined. This is needed
to avoid throwing a warning in case LLCC is not enabled.

Change-Id: I0dea54e0edd89970f0500fffd6ae4689391d2dcb
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>