Revert "x86: Make Dell Latitude E5420 use reboot=pci"

This reverts commit 8b752bf5.

Stefan Cososchi reported a build breakage on 32-bit (only worked
fine on x86_64). It needs a backport of 6c6c51e4 to work. Revert
this patch as it's not critical anyway.

Signed-off-by: Willy Tarreau <w@1wt.eu>