ASoC: samsung: i2s: Simplify pri_dai, sec_dai pointers usage

If the probe call is on the primary DAI we can use 'other' in place of
i2s->sec_dai, if the probe call is on the secondary DAI we can use 'i2s'
in place of other->sec_dai.

While at it fix one whitespace issue.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>