defconfig: arm: Enable DEVMEM and DEVKMEM for couple of SoCs

Enable DEVMEM and DEVKMEM flags for msm8937, msmtitanium and
msmgold SoCs in the defconfig files and keep DEVMEM and
DEVKMEM flag disabled in perf-defconfig files for
CTS(testDevMemSane & testDevkmemSane test) test cases support.

Change-Id: I794739cd0ceac19640af3ebd28d573938cab3b8d
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>