Add ext_config feature to extend qcom's defconfig
There make files can compose some kconfig files into one
Change-Id: Ic1444100f61300e7ee16a81c73afde3dac81da0a
Signed-off-by: zhaoxp3 <zhaoxp3@motorola.com>
Reviewed-on: https://gerrit.mot.com/1499581
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Wang Wang <wangwang1@lenovo.com>
Submit-Approved: Jira Key