bts: Update transmitted MS power as requested by BTS

New generic ms power loop algo takes into account the MS Power sent by
MS over L1 SACCH Header. As a result, the test infra must now update its
transmitted value according to what is requested by the BTS as if it was
a real MS in order for algo to output expected results.

Requires osmocom-bb I975cfc5f5d63eb32a7f8932a7f6a544c9a12233c to have
transmitted MS power values for dummy Meas Results updated as requested
over L1CTL.

Change-Id: I287761202093fbc1064f9868efe6f7f6155253ca
1 file changed