i2c: synquacer: Remove a clk reference from struct synquacer_i2c

'pclk' is only used locally in the probe. Remove it from the
'synquacer_i2c' structure.

Also remove a useless debug message.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>