Core: Rearrange exports in platform.c

Driver core: rearrange exports in platform.c

The new way is to specify export right after symbol definition.
Rearrange exports to follow new style to avoid mixing two styles
in one file.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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