ASoC: tas2781: Use of_property_read_reg()

ASoC: tas2781: Use of_property_read_reg()

[ Upstream commit 31a45f9190b5b4f5cd8cdec8471babd5215eee04 ]

Replace the open-coded parsing of "reg" with of_property_read_reg().
The #ifdef is also easily replaced with IS_ENABLED().

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20240702215402.839673-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Stable-dep-of: c2c0b67dca3c ("ASoC: tas2781-i2c: Drop weird GPIO code")
Signed-off-by: Sasha Levin <sashal@kernel.org>