build-sys: restrict vmcoreinfo to fw_cfg+dma capable targets
vmcoreinfo is built for all targets. However, it requires fw_cfg with DMA operations support (write operation). Restrict vmcoreinfo exposure to architectures that are supporting FW_CFG_DMA, that is arm-virt and x86 only atm. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NDaniel Henrique Barboza <danielhb@linux.vnet.ibm.com> Tested-by: NDaniel Henrique Barboza <danielhb@linux.vnet.ibm.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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