perf scripts python arm-cs-trace-disasm.py: Set start vm addr of exectable file to 0

For exectable ELF file, which e_type is ET_EXEC, dso start address is a
absolute address other than offset. Just set vm_start to zero when dso
start is 0x400000, which means it is a exectable file.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Ruidong Tian <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Al Grant <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Cc: Tor Jeremiassen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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