ASoC: tas2781: Fix occasional calibration failture

The root cause is that TAS2781 internal register is not unlocked
before writing data into TAS2781_PRM_TEST_57_REG.

Fixes: 49e2e353 ("ASoC: tas2781: Add Calibration Kcontrols for Chromebook")
Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://patch.msgid.link/20241227074909.1974-1-shenghao-ding@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>