techpack: add a snapshot of tech package support

Add a snapshot of tech package support from msm-4.19 to msm-4.14 from
commits as of:
'commit <50327f3450f1> (techpack: add tech package support)'
'commit <8082260ee599> (techpack: set configuration default to yes)'
'commit <776ec744ee23> (techpack: Kbuild: Fix to compile the techpack
completely)'.

Change markings to 4.14 style.

Change-Id: I446e7cf0f185181caa5e62cf42a2ff972f99be35
Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org>