thermal: ti-soc-thermal: Simplify polling with iopoll

We can use iopoll for checking the EOCZ (end of conversion) bit. And with
this we now also want to handle the timeout errors properly.

For omap3, we need about 1.2ms for the single mode sampling to wait for
EOCZ down, so let's use 1.5ms timeout there. Waiting for sampling to start
is faster and we can use 1ms timeout.

Cc: Adam Ford <[email protected]>
Cc: Carl Philipp Klemm <[email protected]>
Cc: Eduardo Valentin <[email protected]>
Cc: H. Nikolaus Schaller <[email protected]>
Cc: Merlijn Wajer <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Peter Ujfalusi <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Tested-by: Adam Ford <[email protected]> #logicpd-torpedo-37xx-devkit
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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