i2c: Drop unused CONFIG_I2C

This actually does nothing but is defined by a few dozen boards. Drop it,
so we can define a real one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/bur_am335x_common.h b/include/configs/bur_am335x_common.h
index 042cb46..51585fc 100644
--- a/include/configs/bur_am335x_common.h
+++ b/include/configs/bur_am335x_common.h
@@ -19,7 +19,6 @@
 #define CONFIG_SYS_NS16550_CLK		(48000000)
 #define CONFIG_SYS_NS16550_COM1		0x44e09000
 
-#define CONFIG_I2C
 #define CONFIG_SYS_I2C_LEGACY
 
 #endif /* CONFIG_DM */
diff --git a/include/configs/siemens-am33x-common.h b/include/configs/siemens-am33x-common.h
index abd5e2b..a4b4c48 100644
--- a/include/configs/siemens-am33x-common.h
+++ b/include/configs/siemens-am33x-common.h
@@ -73,7 +73,6 @@
 
 
 /* I2C Configuration */
-#define CONFIG_I2C
 #define CONFIG_SYS_I2C_LEGACY
 
 /* Defines for SPL */
diff --git a/include/configs/ti_armv7_common.h b/include/configs/ti_armv7_common.h
index fe4689c..4fcf741 100644
--- a/include/configs/ti_armv7_common.h
+++ b/include/configs/ti_armv7_common.h
@@ -88,7 +88,6 @@
 
 /* If DM_I2C, enable non-DM I2C support */
 #if !CONFIG_IS_ENABLED(DM_I2C)
-#define CONFIG_I2C
 #define CONFIG_SYS_I2C_LEGACY
 #endif
 
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 91da5d5..66678cf 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -708,7 +708,6 @@
 CONFIG_HVBOOT
 CONFIG_HWCONFIG
 CONFIG_HW_ENV_SETTINGS
-CONFIG_I2C
 CONFIG_I2C_ENV_EEPROM_BUS
 CONFIG_I2C_GSC
 CONFIG_I2C_MBB_TIMEOUT