configs: stm32f746-disco: Migrate CONFIG_CMD_CACHE to defconfig

Remove CONFIG_CMD_CACHE from include/configs/stm32f746-disco.h
and enable it in stm32f746-disco_defconfig
Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>

configs/stm32f746-disco_defconfig

@@ -30,6 +30,7 @@ CONFIG_CMD_SNTP=y
 CONFIG_CMD_DNS=y
 CONFIG_CMD_LINK_LOCAL=y
 CONFIG_CMD_BMP=y
+CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIMER=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y

include/configs/stm32f746-disco.h

@@ -57,7 +57,6 @@
 /*
  * Command line configuration.
  */
-#define CONFIG_CMD_CACHE
 #define CONFIG_BOARD_LATE_INIT
 #define CONFIG_DISPLAY_BOARDINFO