configs: stm32f429-disco: enable MISC, STM32_RCC, DM_RESET and STM32_RESET

This allows to support rcc MFD driver.
By enabling all these flags, we need to increase malloc area to avoid
crash during early stage.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

configs/stm32f429-discovery_defconfig

@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_STM32=y
+CONFIG_SYS_MALLOC_F_LEN=0xF00
 CONFIG_STM32F4=y
 CONFIG_TARGET_STM32F429_DISCOVERY=y
 CONFIG_DEFAULT_DEVICE_TREE="stm32f429-disco"
@@ -18,7 +19,11 @@ CONFIG_CMD_TIMER=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_ENV_IS_IN_FLASH=y
+CONFIG_MISC=y
+CONFIG_STM32_RCC=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_RAM=y
 CONFIG_STM32_SDRAM=y
+CONFIG_DM_RESET=y
+CONFIG_STM32_RESET=y