add genimage files for x86_64 generic profile

target/x86_64/generic-x86_64/genimage-dual.cfg

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+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    in-partition-table = "no"
+    image = "boot.img"
+    offset = 0
+    size = 512
+  }
+
+  partition grub {
+    in-partition-table = "no"
+    image = "grub.img"
+    offset = 512
+  }
+
+  partition root1 {
+    partition-type = 0x83
+    image = "rootfs.ext"
+    size = 64M
+  }
+
+  partition root2 {
+    partition-type = 0x83
+    image = "rootfs.ext"
+    size = 64M
+  }
+
+  partition cfgfs {
+    partition-type = 0x88
+    image = "cfgfs.img"
+  }
+
+}

target/x86_64/generic-x86_64/genimage-efi-dual.cfg

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+image efi-part.vfat {
+  vfat {
+    file EFI {
+      image = "efi-part/EFI"
+    }
+  }
+  size = 32M
+}
+
+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xEF
+    image = "efi-part.vfat"
+  }
+
+  partition root1 {
+    partition-type = 0x83
+    image = "rootfs.ext"
+    size = 128M
+  }
+
+  partition root2 {
+    partition-type = 0x83
+    image = "rootfs.ext"
+    size = 128M
+  }
+
+  partition cfgfs {
+    partition-type = 0x88
+    image = "cfgfs.img"
+  }
+
+}

target/x86_64/generic-x86_64/genimage-efi.cfg

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+image efi-part.vfat {
+  vfat {
+    file EFI {
+      image = "efi-part/EFI"
+    }
+  }
+  size = 32M
+}
+
+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xEF
+    image = "efi-part.vfat"
+  }
+
+  partition root {
+    partition-type = 0x83
+    image = "rootfs.ext"
+  }
+
+  partition cfgfs {
+    partition-type = 0x88
+    image = "cfgfs.img"
+  }
+
+}

target/x86_64/generic-x86_64/genimage.cfg

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+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    in-partition-table = "no"
+    image = "boot.img"
+    offset = 0
+    size = 512
+  }
+
+  partition grub {
+    in-partition-table = "no"
+    image = "grub.img"
+    offset = 512
+  }
+
+  partition root {
+    partition-type = 0x83
+    image = "rootfs.ext"
+    size = 64M
+  }
+
+  partition cfgfs {
+    partition-type = 0x88
+    image = "cfgfs.img"
+  }
+
+}