crypto: atmel-aes - remove calls of clk_prepare() from atomic contexts

crypto: atmel-aes - remove calls of clk_prepare() from atomic contexts

clk_prepare()/clk_unprepare() must not be called within atomic context.

This patch calls clk_prepare() once for all from atmel_aes_probe() and
clk_unprepare() from atmel_aes_remove().

Then calls of clk_prepare_enable()/clk_disable_unprepare() were replaced
by calls of clk_enable()/clk_disable().

Cc: [email protected]
Signed-off-by: Cyrille Pitchen <[email protected]>
Reported-by: Matthias Mayr <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>