defconfig: msm: Add config file msmcortex_defconfig

Introduce a new config msmcortex_defconfig file
for QTI cortex based MSM chipsets in 32bit mode.
Adding basic defconfig for initial bringup with 32bit mode.

Change-Id: I8b38d1be573833ef252f5e4988374280cb5573be
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>