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Fix: NR UE timing adjust

Sakthivel Velumani requested to merge NR_UE_fix_timing_adjust into develop

UE calculates timing offset from received PBCH signal. If there is weak or no PBCH, the calculated offset could be incorrect and the samples are adjusted incorrectly leading to total link failure. This is often observed with over-the-air indoor and outdoor testing.

In this MR, the offset is calculated only when the PBCH is successfully decoded in that frame and its applied in the end of frame. If not, then offset calculated from previous successful PBCH is applied.

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