sigProcLib: Remove trigonometric tables
sigProcLib: Remove trigonometric tables

Trigonometric sin/cos tables are unused after initialization.
There is no benefit to implementing lookup tables for run-once
operations. Also perform initial calculations in double width
because there is no penalty for doing so.

Change-Id: I45bba5daf8610cbba6af95b92c2142f2256491ff

osmocom/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx,ttsou/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx,osmocom/osmo-trx,ttsou/osmo-trx