[efi] Discard .pci_devlist.* sections for EFI images

As per https://github.com/ipxe/ipxe/pull/313#issuecomment-816018398,
these sections are not required for EFI execution.  Discard them to
avoid implementation-defined alignment malforming binaries.

Signed-off-by: Marvin Häuser <mhaeuser@posteo.de>

src/scripts/efi.lds

diff --git a/src/scripts/efi.lds b/src/scripts/efi.lds
index f1049f2..3602254 100644
--- a/src/scripts/efi.lds
+++ b/src/scripts/efi.lds
@@ -106,5 +106,6 @@
 	*(.einfo.*)
 	*(.discard)
 	*(.discard.*)
+	*(.pci_devlist.*)
     }
 }