xen: add /buildinfo/config entry to hypervisor filesystem

Add the /buildinfo/config entry to the hypervisor filesystem. This
entry contains the .config file used to build the hypervisor.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

.gitignore

@@ -298,6 +298,8 @@ xen/arch/*/efi/boot.c
 xen/arch/*/efi/compat.c
 xen/arch/*/efi/efi.h
 xen/arch/*/efi/runtime.c
+xen/common/config_data.S
+xen/common/config.gz
 xen/include/headers*.chk
 xen/include/asm
 xen/include/asm-*/asm-offsets.h