Staging: Westbridge: fix EXPORT_SYMBOL errors reported by checkpatch.pl

This patch fixes errors reported by checkpatch.pl
in westbridge device controller driver in the staging tree.
File containing EXPORT_SYMBOL() macros for all the APIs exported
by the westbridge software has been removed. EXPORT_SYMBOL()
macros are added after the corresponding function definitions.

Signed-off-by: Sutharsan Ramamoorthy <srmt@cypress.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>