sysmobts: Add a magic number to the hLayer2 to differentiate it
sysmobts: Add a magic number to the hLayer2 to differentiate it

The DSP/FPGA appears to report bogus PhDataInd with hlayer2 == 0.
Currently this would match the TRX==0,TS==0 and SS=0 and then we
report bad measurement reports. Add a magic number to the lower
eight bit of the hLayer2 to differentiate valid numbers.

Addresses:
<0004> measurement.c:97 (bts=0,trx=0,ts=0,ss=0) measurement during state: NONE
<0004> measurement.c:102 (bts=0,trx=0,ts=0,ss=0) no space for uplink measurement

geosphere/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts