Use clk_prepare/clk_unprepare as required by the generic clk framework.

Cc: grant.likely@secretlab.ca
cc: spi-devel-general@lists.sourceforge.net
Signed-off-by: NPrashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>