spi: Use reinit_completion at appropriate places

Calling init_completion() once is enough.
For the rest of the iterations, call reinit_completion() instead.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc drivers/spi/spi-bcm63xx-hsspi.c
Simple merge

diff --cc drivers/spi/spi-bcm63xx.c
Simple merge

diff --cc drivers/spi/spi-efm32.c
Simple merge

diff --cc drivers/spi/spi-imx.c
Simple merge