spi: sh-hspi: Remove hspi_cleanup function

hspi_cleanup() is doing nothing except print a non-useful debug message,
so remove it.  Also remove unused hspi2info macro.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>