accel/habanalabs/gaudi2: revise return value handling in gaudi2_hbm_sei_handle_read_err()

accel/habanalabs/gaudi2: revise return value handling in gaudi2_hbm_sei_handle_read_err()

The return value in gaudi2_hbm_sei_handle_read_err() is boolean and not
a bitmask, so there is need for "|= true".
In addition, rename the 'rc' variable, as no "return code" is returned
here but an indication if a hard reset is required.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Ofir Bitton <obitton@habana.ai>
Signed-off-by: Ofir Bitton <obitton@habana.ai>