manifest:mcuboot: remove mcuboot due to unexpected bringup

2 job 于remove_mcu_boot in 4 minute 和 17 second (queued for 1 second)
状态 作业 ID 名称 覆盖率
  Ztest
已通过 #43450
zgsz-02 generic
ztest_build_only

00:02:22

已通过 #43451
zgsz-03 with-device
ztest_device_test

00:04:17