This patch adds UEFI support for iPXE, the changes made are:
* Remove conditional preventing iPXE to be configured with UEFI
* Add the boot_mode= kernel parameter to the iPXE template
* Add initrd=deploy_ramdisk kernel parameter to the iPXE template. The
UEFI support in iPXE requires the kernel argument to match what the
initrd expects. For more information see [0]
[0] http://forum.ipxe.org/showthread.php?tid=7589&pid=11843#pid11843
Closes-Bug: #1525989
Change-Id: I6e74bc6332c5aba92ef0de8694fd4259c596cf03