Convert CONFIG_STM32_FLASH to Kconfig

This converts the CONFIG_STM32_FLASH to Kconfig by using
tools/moveconfig.py

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/configs/stm32f429-evaluation_defconfig b/configs/stm32f429-evaluation_defconfig
index b614182..a15a68c 100644
--- a/configs/stm32f429-evaluation_defconfig
+++ b/configs/stm32f429-evaluation_defconfig
@@ -26,3 +26,4 @@
 # CONFIG_NET is not set
 CONFIG_ARM_PL180_MMCI=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_STM32_FLASH=y