dt-bindings: eeprom-93xx46: Add support for 93C46, 93C56 and 93C66

These devices differ by the size of their storage, which is why they
have different compatible strings.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Link: https://lore.kernel.org/r/20210511210727.24895-4-linkmauve@linkmauve.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/misc/eeprom-93xx46.txt

@@ -2,7 +2,10 @@ EEPROMs (SPI) compatible with Microchip Technology 93xx46 family.
 
 Required properties:
 - compatible : shall be one of:
+    "atmel,at93c46"
     "atmel,at93c46d"
+    "atmel,at93c56"
+    "atmel,at93c66"
     "eeprom-93xx46"
     "microchip,93lc46b"
 - data-size : number of data bits per word (either 8 or 16)