boot: mcuboot_recovery_retention: bootloader.mcuboot.recovery.retention* reports timeout

[katgiadla]

Describe the bug
Tests

• tests/boot/mcuboot_recovery_retention/bootloader.mcuboot.recovery.retention
• tests/boot/mcuboot_recovery_retention/bootloader.mcuboot.recovery.retention.mem

report timeout.

Observed for nrf52840dk/nrf52840.

To Reproduce
Steps to reproduce the behavior:

1. have nrf52840dk/nrf52840 connected
2. go to your zephyr dir
3. call ./scripts/twister -T tests/boot/mcuboot_recovery_retention -p nrf52840dk/nrf52840 --device-testing --device-serial /dev/ttyACM0 -v --inline-logs --west-flash="--erase"
4. See console output with error

Expected behavior
Valid console output

Impact
Not clear

Logs and console output

mcuboot_status: 0
mcuboot_status: 2
Waiting...
*** Booting Zephyr OS build v4.0.0-2414-g73af324c072c ***
mcuboot_status: 0
mcuboot_status: 8
*** Booting MCUboot f5454f163582 ***
*** Using Zephyr OS build v4.0.0-2414-g73af324c072c ***
[00:00:00.251,464] <inf> mcuboot: Starting bootloader
[00:00:00.253,845] <inf> mcuboot: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
[00:00:00.253,906] <inf> mcuboot: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
[00:00:00.253,906] <inf> mcuboot: Boot source: none
[00:00:00.253,997] <inf> mcuboot: Image index: 0, Swap type: none
[00:00:00.255,584] <inf> mcuboot: Enter the serial recovery mode

Environment (please complete the following information):

• OS: Ubuntu 20.04.1 LTS
• Toolchain: Zephyr SDK 0.17.0
• Commit SHA or Version used: v4.0.0-2414-g73af32

Addtional information
Probably introduced by 6dc185b