BTS_Tests: introduce and use as_l1_sacch_l1h()

The new altstep reduces code duplication and simplifies access
to the L1 SACCH Header.  It uses dec_SacchL1Header() to decode
the header, and would apply the received TA / MS Power level
values by default (see 'do_apply' parameter).

Change-Id: Ie593d9b06aea694fb0903a6d26ee387d8da4c82d
Related: SYS#4918
1 file changed