i2c: sun6i-p2wi: Use devm_clk_get_enabled()

Replace the pair of functions, devm_clk_get() and clk_prepare_enable(),
with a single function devm_clk_get_enabled().

Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>