defconfig: arm: msm: Enable MSM_KGSL config flag

Enable the KGSL driver to support Graphics acceleration.
msm8937_defconfig is used for msm8937 target and
msmcortex_defconfig is used for msmtitanium SOC.

Change-Id: I42c7af47d0908351e4dad4f27931ab90c888f55b
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>