dfu: Make the DFU_WRITE_ALT symbol available outside of DFU

The DFU_WRITE_ALT symbol is used both directly and indirectly (via
UPDATE_COMMON) for EFI capsule updates (FIT or raw), but does not depend
on DFU itself. Move this symbol outside of "if DFU" to remove a Kconfig
dependency problem.

Signed-off-by: Tom Rini <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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