dt-bindings: trivial-devices: Drop incorrect and duplicate at24 compatibles

"at,24c08" does not have a correct vendor prefix. The correct compatible
string would be "atmel,24c08" which is already documented in at24.yaml.
It is also unused anywhere, so just drop it.

"st,24c256" is already documented in at24.yaml, so drop it as well.

Link: https://lore.kernel.org/r/20240903-dt-trivial-devices-v1-1-ad684c754b9c@kernel.orgSigned-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -50,8 +50,6 @@ properties:
           - ams,iaq-core
             # Temperature monitoring of Astera Labs PT5161L PCIe retimer
           - asteralabs,pt5161l
-            # i2c serial eeprom (24cxx)
-          - at,24c08
             # i2c h/w elliptic curve crypto module
           - atmel,atecc508a
             # ATSHA204 - i2c h/w symmetric crypto module
@@ -366,8 +364,6 @@ properties:
           - skyworks,sky81452
             # SparkFun Qwiic Joystick (COM-15168) with i2c interface
           - sparkfun,qwiic-joystick
-            # i2c serial eeprom (24cxx)
-          - st,24c256
             # Sierra Wireless mangOH Green SPI IoT interface
           - swir,mangoh-iotport-spi
             # Ambient Light Sensor with SMBUS/Two Wire Serial Interface