i2c: eeprom: Use reg property instead of offset and size

Remove adhoc dt binding for fixed-partition definition for i2c eeprom.
fixed-partition are using reg property instead of offset/size pair.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index fe11128..acd7093 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -119,6 +119,7 @@
 CONFIG_DM_BOOTCOUNT_RTC=y
 CONFIG_BUTTON=y
 CONFIG_BUTTON_GPIO=y
+CONFIG_DM_BOOTCOUNT_I2C_EEPROM=y
 CONFIG_CLK=y
 CONFIG_CLK_COMPOSITE_CCF=y
 CONFIG_SANDBOX_CLK_CCF=y