defconfig: msm8909: enable access to config file

Configs CONFIG_IKCONFIG and CONFIG_IKCONFIG_PROC are needed to
access .config file through /proc/config.gz. without this file,
VtsKernelConfig and other tests are failing since these are not
able to find the required kernel configurations.

Change-Id: I8245650842dd0f9d7cd31bbeb4784fe8eb71e657
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>