staging: speakup: Add blank line after declarations

Patch fixes the warnings reported by checkpatch.pl
for please use a blank line after function/struct/union/enum
declarations.
Add a blank line after enum and struct declarations.

Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>