defconfig: arm64: Increase kmemleak log size for couple of SoCs

Increase default kmemleak log size to 4000 from 400
to avoid kmemleak buffer overflow warnings. msmcortex_defconfig
file is used for msmtitanium and msm8937_deconfig file is used
for msm8937 and msmgold SoCs.

Change-Id: I4b4b8aeaf4ae0e9c12f176c890358edc647f95c2
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>