Revert "add kill_dss option to hbootmod.ko"

This reverts commit a4f1fef3795304f2c66a05b85c0a5d5514af1c21.
Revert "missing symbol find_my_dev"

This reverts commit a636d13ccda9d4cf3924ef8d7e9848af2a3b6342.
Revert "update 2ndboot module with "dss disable" support"

This reverts commit 3d92f4f429cc4883790fc7eda0e06bb81bece96f.