wifi: mt76: add external EEPROM support for mt799x chipsets

wifi: mt76: add external EEPROM support for mt799x chipsets

For the MT7992 and MT7990 chipsets, efuse mode is not supported because
there is insufficient space in the efuse to store the calibration data.
Therefore, an additional on-chip EEPROM is added to address this
limitation.

Co-developed-by: Elwin Huang <s09289728096@gmail.com>
Signed-off-by: Elwin Huang <s09289728096@gmail.com>
Co-developed-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Link: https://patch.msgid.link/20260212090310.3335392-1-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>