arm64: dts: freescale: imx93-phycore-som: Add eMMC no-1-8-v by default

arm64: dts: freescale: imx93-phycore-som: Add eMMC no-1-8-v by default

The phyCORE-i.MX93 SoM comes in two variants, one with VDD_IO set to
3.3V and the other variant to 1.8V. The 3.3V variant can only support
DDR52 mode, while 1.8V variant is capable of HS400ES eMMC mode. The
information about VDD_IO option is encoded in the SoM's EEPROM. EEPROM
is read in the bootloader and bootloader clears the "no-1-8-v" flag in
case of 1.8V SoM variant is detected. Thus add property 'no-1-8-v' by
default to usdhc1 (eMMC) node and let bootloader handle the flag. In
case EEPROM is erased or read-out fails, flag "no-1-8-v" also ensures
fall-back compatibility with both SoM variants.

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>