ASoC: ti: ams-delta: Stop (ab)using card->pop_time

A flag is needed that tells the card driver if the codec has been
initialized successfully over the modem's line discipline.  Initially,
codec->hw_write was used as the flag, but it was then dropped and the
flag function associated with card->pop_time, already managed by the
codec driver for diagnostic purposes.  Since now the card->pop_time is
going to be killed, stop abusing foreign fields in favor of an own one.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87v7ctwj0w.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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