selftests: secureboot: use ovmf from a temporary location
selftests: secureboot: use ovmf from a temporary location

Since the tests are modifying ovmf's nvram vars, we copy all ovmf
files in a temporary location and tell runqemu to use the files from
there.

Signed-off-by: Mikko Ylinen <abf10a3f4012ad01778af181914ce7d6fddc40b3@linux.intel.com>

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