Document the Linux build instructions for EDK2.
TEST=Build EDK2 for Quark on Ubuntu 14.04
Change-Id: I5f87eb2c5879f2fd4dd18880908756089a0c7a51
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13644
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>