Remove sys_test_driver implicit type conversion
Remove sys_test_driver implicit type conversion

sys_test_driver had a implicit type conversion from
'unsigned long long' to 'uint64_t' in a loop. Replaced 'uint64_t'
with 'auto'.

PiperOrigin-RevId: 262023863
Change-Id: I8603de545ec04d804fb63389fdb41d166e2f033d

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo