dt-bindings: eeprom: microchip,93lc46b: move to eeprom directory

Move the Atmel/Microchip 93xx46 SPI compatible EEPROM family bindings
from misc to eeprom directory to properly match subsystem.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220727164424.386499-2-krzysztof.kozlowski@linaro.org