platform/dcdbas: move EXPORT_SYMBOL after function

platform/dcdbas: move EXPORT_SYMBOL after function

The declaration
        EXPORT_SYMBOL(dcdbas_smi_request);
was placed after smi_request_store(), which made a false impression that
dcdbas_smi_request() was not exported.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Gross <markgross@kernel.org>
Link: https://lore.kernel.org/r/20220212125908.357588-1-mat.jonczyk@o2.pl
Signed-off-by: Hans de Goede <hdegoede@redhat.com>