BTS_Tests.ttcn: add TC_pcu_ext_rach_content() for 11-bit RACH

According to 3GPP TS 04.60, section 11.2.5a, the extended (11-bit)
Access Burst on RACH/PRACH is used by the MS to indicate its EGPRS
capability. One of the alternative synch. sequences (see 3GPP TS
05.02, TS1 and TS2) shall be used.

Add a test case to verify extended (11-bit) RACH decoding.

Depends: (OsmocomBB) I36fd20cd5502ce33c52f644ee4c22abb83350df8
Change-Id: I8fe156aeac9de3dc1e71a4950821d4942ba9a253
Related: OS#1854
3 files changed