UPSTREAM: spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs

UPSTREAM: spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs

Rockchip_spi_set_cs could be called by spi_setup, but
spi_setup may be called by device driver after runtime suspend.
Then the spi clock is closed, rockchip_spi_set_cs may access the
spi registers, which causes cpu block in some socs.

Change-Id: I58915aee30cfbd3098eb137e3d9046b59ad9476c
Fixes: 64e36824b32 ("spi/rockchip: add driver for Rockchip RK3xxx")
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from git.kernel.org broonie/spi.git for-next
 commit b920cc3191d7612f26f36ee494e05b5ffd9044c0)