test: dm: add PHY common props unit tests and sandbox DT nodes

Add sandbox DM unit tests for the PHY common properties library and the
corresponding device tree test nodes to arch/sandbox/dts/test.dts.
Also enable CONFIG_PHY_COMMON_PROPS in configs/sandbox_defconfig so
the tests are built and run in the sandbox environment.

The test file covers rx/tx polarity lookups for all relevant cases:

  - missing property (defaults to PHY_POL_NORMAL)
  - single value without names array (applies to all modes)
  - count mismatch between values and names arrays (-EINVAL)
  - name found by exact match
  - name not found with no "default" fallback (-EINVAL)
  - name not found with a "default" entry (uses fallback value)
  - unsupported polarity value (-EOPNOTSUPP)

Ported from Linux KUnit test:
  linux/drivers/phy/phy-common-props-test.c

Signed-off-by: Lucien.Jheng <[email protected]>

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