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The INA237 "85-V, 16-Bit, Precision Power Monitor With I2C Interface" is
basically the same as INA328. Therefore add a corresponding compatible
to the driver.

According to the datasheet the main difference is the current and power
monitoring accuracy:

+------------------------+---------------+---------------+
|                        | INA238        | INA237        |
+------------------------+---------------+---------------+
| Offset voltage         | +/- 5µV       | +/- 50µV      |
| Offset drift           | +/- 0.02µV/°C | +/- 0.02µV/°C |
| Gain error             | +/- 0.1%      | +/- 0.3%      |
| Gain error drift       | +/- 25ppm/°C  | +/- 50ppm/°C  |
| Common mode rejection  | 140dB         | 120dB         |
| Power accuracy         | 0.7%          | 1.6%          |
+------------------------+---------------+---------------+

As well as the missing DEVICE_ID register at 0x3F, which is currently
not in use by the driver.
Signed-off-by: Richard Leitner <richard.leitner@linux.dev>
Link: https://lore.kernel.org/r/20231026-ina237-v2-1-dec44811a3c9@linux.dev

Signed-off-by: Guenter Roeck <linux@roeck-us.net>