Remove reference to unavailable boot method 'fastboot-boot-image'.
Remove reference to unavailable boot method 'fastboot-boot-image'.

Change-Id: I6852552ab5cbf94aefa6df3e36d4bd194c9933f6

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server