west.yaml: MCUboot synchronization from upstream

Update Zephyr fork of MCUboot to revision:
  fc658eb5a22b7b1721c3b7d0853a7115fae08939

Brings following Zephyr relevant fixes:
 - c9fa608 boot: boot_serial: Fix issue with encrypted second slot
           images
 - 25d2f2c zephyr: encryption: Improve Kconfig and key generation
 - 99613c6 bootutil: fix downgrade prevention
 - 5b1d511 boot: bootutil: Add optional boot info shared data
           saving
 - ea88860 bootutil: Add bootloader info TLV entries
 - 3016d00 bootutil: Add active slot number and max app size to
           shared data
 - 0540d0f bootutil: Fix for flash_area_id_to_image
 - f17b005 bootutil: Fix boot_set_next passing wrong image number
 - fefc398 fix: update zephyr CONFIG_BOOTLOADER_MCUBOOT
 - 61898da boot: boot_serial: Add updated SMP header
 - 36ae4fd boot: zephyr: split esp32 to
           esp32_devkitc_{wroom,wrover}
 - 2c86755 boot: zephyr: Fix indication LED not selecting GPIO

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>