wifi: rtw89: 8922d: read default digital voltage calibration values

In order to lower temperature when WiFi is running, reduce the digital
voltage for the purpose.

The calibration values of digital voltage are programmed in efuse. One is
for normal use, which driver stores it into hal->thermal_prot_vmax. The
other is the minimum voltage, which is stored into hal->thermal_prot_vmin.
These two values define a range of supported voltage, which latter patch
uses them to adjust voltage depends on thermal value (temperature).

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260707091056.42771-9-pkshih@realtek.com

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