Revert "proprietary-blobs: keymaster"

This is not the solution we were looking for.

This reverts commit 9a00653faa865616b18dbf06a6fe44a6c9153df5.
8960 keystore:  Kill it with fire.

It requires keymaster firmware compatible with our device - which
doesn't exist.

Stock doesn't use 8960 keystore, neither does CM on Sony blue
or fusion3.

Change-Id: Ib56d94074ad98ed07520d1c16609c80f1d815ba8