Revert "Initial webOS support"

This reverts commit 813f77514d2dae1e5185dac1b29133694ff3aa1c.
Restore build
[m5] Implement booting of kexec-based ROMs with configuration in text file

* Can handle at least ubuntu and webOS, but potentially anything
  without changing a single line in the code. See rom_info.txt.
Do not allow to boot kexec ROMs with whitespace in name