Add amd64 recognition create_legacy_bootloader_templates.sh
Add amd64 recognition create_legacy_bootloader_templates.sh

This causes the script to treat amd64 the same as x86.

BUG=chromium-os:21284
TEST=./build_image for amd64-generic shouldn't generate an invalid
    architecture error

Change-Id: I37284def3cb2f0b16ece20a74d65bdb8e0116cff
Reviewed-on: http://gerrit.chromium.org/gerrit/9962
Reviewed-by: Vince Laviano <078fdc12f75830a35bf00d22698684fd6d27273d@chromium.org>
Commit-Ready: Sonny Rao <d867fc987a366be56684d1145622524a3ba1efbf@chromium.org>
Tested-by: Sonny Rao <d867fc987a366be56684d1145622524a3ba1efbf@chromium.org>

smilart/scripts,smilart/scripts,mischief/scripts,sigma/coreos-scripts,mischief/scripts,mischief/scripts,gtank/scripts,endocode/scripts,trnubo/scripts,sigma/coreos-scripts,bcwaldon/coreos-scripts,trnubo/scripts,nicescale/scripts,zhang0137/scripts,crawford/scripts,vmware/coreos-scripts,fivethreeo/scripts,BugRoger/scripts,bcwaldon/coreos-scripts,marineam/coreos-scripts,mjg59/scripts,zhang0137/scripts,fivethreeo/scripts,zhang0137/scripts,endocode/scripts,endocode/scripts,glevand/coreos--scripts,nicescale/scripts,mjg59/scripts,andrejro/coreos--scripts,crawford/scripts,andrejro/coreos--scripts,glevand/coreos--scripts,andrejro/coreos--scripts,fivethreeo/scripts,coreos/scripts,trnubo/scripts,vmware/coreos-scripts,BugRoger/scripts,gtank/scripts,coreos/scripts,vmware/coreos-scripts,gtank/scripts,bcwaldon/coreos-scripts,crawford/scripts,sigma/coreos-scripts,marineam/coreos-scripts,smilart/scripts,mjg59/scripts,BugRoger/scripts,nicescale/scripts,marineam/coreos-scripts