[efi] Do not align VirtualSize for .reloc and .debug sections

[efi] Do not align VirtualSize for .reloc and .debug sections

As of commit f1e9e2b ("[efi] Align EFI image sections by page size"),
the VirtualSize fields for the .reloc and .debug sections have been
rounded up to the (4kB) image alignment.  This breaks the PE
relocation logic in the UEFI shim, which requires the VirtualSize
field to exactly match the size as recorded in the data directory.

Fix by setting the VirtualSize field to the unaligned size of the
section, as is already done for normal PE sections (i.e. those other
than .reloc and .debug).

Signed-off-by: Michael Brown <mcb30@ipxe.org>