The 8 qemu-* targets all contained nearly-identical copies of the
targets to prepare the TPM/disk/etc. and then run Qemu. The only
significant differences were for TPM1/TPM2 (extra swtpm_setup step,
addition of --tpm2 to swtpm_setup and swtpm). ROOT_DISK_IMG used := or
= differently in some boards, := was kept.
targets/qemu.mk now defines all Qemu targets and is included only for
qemu-* boards (by defining BOARD_TARGETS in each of those boards).
The documentation was moved from qemu-coreboot-fbwhiptail-tpm1-hotp/
qemu-coreboot-fbwhiptail-tpm1-htop.md to targets/qemu.md. The other 7
qemu boards' symlinks to that file were removed.
Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>