Upload: Fix mbed_adjust_upload_debug_commands for multiple targets #923

Job	Run time
cmake-checks	2m 47s
check-cmsis-mcu-descriptions-matches-target-list	32s
docs-check	56s
include-check	1m 5s
license-check	2m 16s
pin-validation	1m 2s
python-tests	1m 14s
style-check	1m 25s
	11m 17s

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