tree f892cfaf37581bb30ec3113e6b4364a3d7d27611
parent dd7ceb96441db96c790e286f8548288a04027c58
author Michael Munday <mike.munday@lowrisc.org> 1616423757 +0000
committer Philipp Wagner <mail@philipp-wagner.com> 1616431590 +0000

[dif] Add missing `extern "C"` declarations.

DIFs are implemented in C and so the API requires C linkage in C++.
The current template includes the necessary `extern "C"`
declaration but the hmac and usbdev header files did not have it.

Signed-off-by: Michael Munday <mike.munday@lowrisc.org>