ARM: dts: stm32: correct vcc-supply for eeprom on stm32mp15xx-osd32

According to the OSD32MP1 Power System overview[1] the EEPROM is connected to
the VDD line and not to some single-purpose fixed regulator.
Set the EEPROM supply according to the diagram to eliminate this parent-less
regulator.

[1]: https://octavosystems.com/app_notes/osd32mp1-power-system-overview/#connections



Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>
Acked-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>