Vlv2TbltDevicePkg: fix ASSERT_EFI_ERROR() typos

A number of code locations use

  ASSERT_EFI_ERROR (BooleanExpression)

instead of

  ASSERT (BooleanExpression)

Fix them.

Cc: David Wei <david.wei@intel.com>
Cc: Tim He <tim.he@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: David Wei <david.wei@intel.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>