fix(arm,bootloaders): use correct blsdir when boot is not separate #4371

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,...	46s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 13s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.9, ...	53s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	1m 21s
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 31s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 2.7, ...	1m 19s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 2...	6m 45s
	24m 40s

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