ASoC: ti: davinci-mcasp: Streamline pdir behavior across rx & tx streams

ASoC: ti: davinci-mcasp: Streamline pdir behavior across rx & tx streams

Simplify the mcasp_set_clk_pdir caller convention in start/stop stream
function, to make it so that set_clk_pdir gets called regardless when
stream starts and also disables when stream ends.

Functionality-wise, everything remains the same as the previously skipped
calls are now either correctly configured
(when McASP is SND_SOC_DAIFMT_BP_FC - pdir needs to be enabled)
or called with a bitmask of zero (when McASP is SND_SOC_DAIFMT_BC_FC - pdir
gets disabled).

On brief regarding McASP Clock and Frame sync configurations, refer to [0].

[0]:TRM Section 12.1.1.4.2 https://www.ti.com/lit/ug/sprujd4a/sprujd4a.pdf

Signed-off-by: Sen Wang <sen@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Tested-by: Paresh Bhagat <p-bhagat@ti.com>
Link: https://patch.msgid.link/20260203003703.2334443-4-sen@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>