ARM: zynq: Convert dlc20 and zc70x board to DM_I2C

All these board have also eeprom enabled that's why it is also enabled
via defconfig.
There is also no need to have zc70x specific config file that's why also
remove it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/zynq_dlc20_rev1_0_defconfig b/configs/zynq_dlc20_rev1_0_defconfig
index 0af36ec..c61010f 100644
--- a/configs/zynq_dlc20_rev1_0_defconfig
+++ b/configs/zynq_dlc20_rev1_0_defconfig
@@ -18,7 +18,6 @@
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_PROMPT="Zynq> "
 CONFIG_CMD_THOR_DOWNLOAD=y
-CONFIG_CMD_EEPROM=y
 CONFIG_CMD_DFU=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_FPGA_LOADBP=y
@@ -43,8 +42,12 @@
 CONFIG_FPGA_XILINX=y
 CONFIG_FPGA_ZYNQPL=y
 CONFIG_DM_GPIO=y
-CONFIG_SYS_I2C_ZYNQ=y
-CONFIG_ZYNQ_I2C0=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_CADENCE=y
+CONFIG_MISC=y
+CONFIG_I2C_EEPROM=y
+CONFIG_SYS_I2C_EEPROM_ADDR=0x0
+CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW=0x0
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
 CONFIG_SPI_FLASH=y