configs: Migrate CONFIG_SYS_MAX_FLASH_BANKS to Kconfig

Use moveconfig.py script to convert define CONFIG_SYS_MAX_FLASH_BANKS
and CONFIG_SYS_MAX_FLASH_BANKS_DETECT to Kconfig and move these entries
to defconfigs.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
[trini: Re-switch to IS_ENABLED check in spi-nor-core.c, re-run migration]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/stm32f429-discovery_defconfig b/configs/stm32f429-discovery_defconfig
index 50348e0..6bd52ee 100644
--- a/configs/stm32f429-discovery_defconfig
+++ b/configs/stm32f429-discovery_defconfig
@@ -29,3 +29,4 @@
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_STM32_FLASH=y
+CONFIG_SYS_MAX_FLASH_BANKS=2