Privacy information about IMEI has been removed from the log.

The Ril DEVICE_IMEI response message printed sim slot's imei.
Modified so that it is not output to the log as it is privacy info.
< DEVICE_IMEI

Bug: 301877487
Test: atest RILTest, on device tests manually
Change-Id: I2688171050129e02b947bb2114152c6c9c543cc9