ARM: dts: stm32: use correct vqmmc regu for eMMC on stm32mp1 ED1/EV1 boards

On those boards, as stated in schematics files, the regulator used for IOs
is VDD. It was wrongly set to v3v3.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>