fix(arm,bootloaders): use correct blsdir when boot is not separate #4387

Job	Run time
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.12...	50s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 12s
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.9,...	47s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 9s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.9, ...	52s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	1m 24s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.6, ...	1m 5s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	3m 35s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 3.6, ...	1m 10s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 3...	4m 25s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 2.7, ...	1m 23s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 2...	6m 50s
	24m 42s

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