defconfig: msm: Disable the board file initialization of other target

Disable the board file initialization of targets other than IOT
apq8053 in LE for memory optimisation. Add apq8053 dependency
for compilation.
Not applicable for apq8053.

Change-Id: Ib23fa059ebab457df40a7ba2fdd7b1027d4884ba
Signed-off-by: Shadab Naseem <snaseem@codeaurora.org>