dpll: zl3073x: add die temperature reporting for supported chips

dpll: zl3073x: add die temperature reporting for supported chips

Some zl3073x chip variants (0x1Exx, 0x2Exx and 0x3FC4) provide a die
temperature status register with 0.1 C resolution.

Add a ZL3073X_FLAG_DIE_TEMP chip flag to identify these variants and
implement zl3073x_dpll_temp_get() as the dpll_device_ops.temp_get
callback. The register value is converted from 0.1 C units to
millidegrees as expected by the DPLL subsystem.

To support per-instance ops selection, copy the base dpll_device_ops
into struct zl3073x_dpll and conditionally set .temp_get during device
registration based on the chip flag.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Link: https://patch.msgid.link/20260227105300.710272-3-ivecera@redhat.com
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>