add the ttyAMA0 console to ipxe script (#239)

this allows an arm64 qemu vm to be pxe booted

Author: asergeant01

templates/ipxe-script.tpl

@@ -6,7 +6,7 @@ set initrd-url {{.InitrdURL}}
 set squashfs-url {{.SquashfsURL}}
 
 echo Loading kernel...
-kernel ${kernel-url} initrd=initrd gl.ovl=/:tmpfs gl.url=${squashfs-url} gl.live=1 ip=any ignition.firstboot=1 ignition.config.url=${ipxe-svc}/ignition/${uuid} ignition.platform.id=metal console=ttyS0,115200 console=tty0 earlyprintk=ttyS0,115200 consoleblank=0
+kernel ${kernel-url} initrd=initrd gl.ovl=/:tmpfs gl.url=${squashfs-url} gl.live=1 ip=any ignition.firstboot=1 ignition.config.url=${ipxe-svc}/ignition/${uuid} ignition.platform.id=metal console=ttyS0,115200 console=tty0 console=ttyAMA0 earlyprintk=ttyS0,115200 consoleblank=0
 echo Loading initrd...
 initrd ${initrd-url}
 echo Booting...