x86: conga-qeval20-qa3: Add SMBus support and SMSC2513 config code

This patch includes the following changes:

- Remove Designware I2C support from dts as its not used
- Configure SMBus PADs in dts
- Enable I2C commands and I2C support
- Configure SMSC2513 USB hub via SMBus upon startup
- Move environment location to match Minnowmax example
- Enhancement of the default environment

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

configs/conga-qeval20-qa3-e3845-internal-uart_defconfig

@@ -1,4 +1,5 @@
 CONFIG_X86=y
+CONFIG_DM_I2C=y
 CONFIG_VENDOR_CONGATEC=y
 CONFIG_TARGET_CONGA_QEVAL20_QA3_E3845=y
 CONFIG_DEFAULT_DEVICE_TREE="conga-qeval20-qa3-e3845"
@@ -22,6 +23,7 @@ CONFIG_CMD_CPU=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_SPI=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
@@ -39,6 +41,7 @@ CONFIG_OF_CONTROL=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
 CONFIG_CPU=y
+CONFIG_SYS_I2C_INTEL=y
 CONFIG_WINBOND_W83627=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_GIGADEVICE=y

configs/conga-qeval20-qa3-e3845_defconfig

@@ -1,4 +1,5 @@
 CONFIG_X86=y
+CONFIG_DM_I2C=y
 CONFIG_VENDOR_CONGATEC=y
 CONFIG_TARGET_CONGA_QEVAL20_QA3_E3845=y
 CONFIG_DEFAULT_DEVICE_TREE="conga-qeval20-qa3-e3845"
@@ -21,6 +22,7 @@ CONFIG_CMD_CPU=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_SPI=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
@@ -38,6 +40,7 @@ CONFIG_OF_CONTROL=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
 CONFIG_CPU=y
+CONFIG_SYS_I2C_INTEL=y
 CONFIG_WINBOND_W83627=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_GIGADEVICE=y