OVMF build for Intel TDX (aka "TDVF") was disabled in favor of Ubuntu/
CentOS pre-upstream releases of Intel TDX.
See 4292c4c3b1.
It's time to re-enable the build and move runtime configurations to
use it (the latter will be done in a later commit).
This is a partial revert of 4292c4c3b with the following changes:
- Stop calling OVMF for Intel TDX "TDVF" and follow the naming distros
use for TDX enabled build: OVMF.inteltdx.fd.
- Single binary OVMF.inteltdx.fd is supported using -bios QEMU param.
- Secure Boot infrastructure is disabled since Kata does not support it.
Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>