add dell poweredge r7515

dell/poweredge/README.md

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+[Dell Poweredge R7515](https://www.dell.com/en-us/work/shop/productdetailstxn/poweredge-r7515#techspecs_section)
+
+## Install bios update via UEFI
+
+UEFI updates cannot be updated via the iDrac since it only supports BIOS
+firmware files.  If you use systemd boot you can however download the EFI
+firmware file and put it in `/boot/EFI/Dell/bios-update.efi`.
+
+Also write the following efi boot entry file as
+`/boot/loader/entries/z-efi-update.conf`:
+
+```
+title EFI update
+efi /efi/Dell/bios-update.efi
+```

dell/poweredge/r7515/default.nix

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+{ ... }:
+{
+  imports = [
+    ../../../common/cpu/amd
+  ];
+}