This commit brings 3 fixes/improvements applied to the Kconfig options
for SPI Flash file system support on board bring-up:
- (925e8f9) Optionally mount SPI Flash MTD on bring-up
- (f74c6f7) Transform SPI Flash FS deps into reverse deps
- (9056cab) Select MTD_SMART if SmartFS is selected for SPI Flash MTD
Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>