libata fixes for NVME + OPAL

From: Enrico Weigelt, metux IT consult
Date: Wed Apr 24 2019 - 06:35:16 EST

Hello folks,

here're some fixes for libata to make NVME and TCG OPAL work:

* fix a little build break in nvme (forgotten include and Kconfig select)
* introduce sysctl knob for enabling tpm stuff at runtime
(sed-util expects since several years, so it seems that piece just might
have been forgotten when opal support was mainlined)