INA237 Sensor Driver Power Calculation Wrong

[EricNRS]

Describe the bug
The INA237 power calculations are incorrect and show overflow issues and are 1000x too small.

Incorrect value seems to imply overflow in calculation since it doesn't follow the off-by-1000 issue seen later.

DEBUG   - OUTPUT: START - test_power
DEBUG   - OUTPUT: 
DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 855.637965 C, got 0.426141 C
DEBUG   - OUTPUT: 

Off by a factor of 1000:

DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 3.342285 C, got 0.003342 C
DEBUG   - OUTPUT: 
DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 1.671117 C, got 0.001671 C
DEBUG   - OUTPUT: 
DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 0.051000 C, got 0.000051 C
DEBUG   - OUTPUT: 
DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 0.005100 C, got 0.000005 C
DEBUG   - OUTPUT: 
DEBUG   - OUTPUT:     Expectation failed at WEST_TOPDIR/zephyr/tests/drivers/sensor/ina237/src/ina237_test.c:137: test_power: (power_expected_W not within power_actual_W +/- 1e-6)
DEBUG   - OUTPUT: Expected 0.000051 C, got 0.000000 C
DEBUG   - OUTPUT:  FAIL - test_power in 0.000 seconds

To Reproduce
I have written a new test case for this while I was debugging it and will upload this with the fix.

./scripts/twister -vv -p native_posix -T tests/drivers/sensor/ina237

[github-actions]

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[EricNRS]

Fixes for the issue uploaded and ready for review.