Changes

vty: fix osmo_cpu_sched_vty_init() prototype

Change return type of osmo_cpu_sched_vty_init() from void to int
to match its implementation.

This fixes a prototype mismatch rejected by stricter compilers
(e.g. Emscripten).

Change-Id: Ia86e8063178ad82de098c2ff693cfbcd7e9f2192

vty: make CPU scheduling optional based on platform support

Add configure checks for sched_* APIs and guard their usage
in cpu_sched_vty with HAVE_SCHED_* macros.

If scheduler functions are not available, return -ENOTSUP
instead of failing at build time.

This improves portability on platforms lacking full sched
support (e.g. non-Linux or restricted environments).

Change-Id: Ic5b7e39fac16531d370cb81f769ba87fef18cb81

gsm0808: fix wrong codec defaults for OFR_AMR_WB
3GPP TS 48.008 chapter 3.2.2.103 states that the configuration bits of
OFR_AMR_WB are coded as follows:
"S0, S2, S4 indicates the supported Codec Configurations. S1, S3, S5,
S6, S7 are reserved and coded with zeroes."
The current default setting of 0x3F violates this requirement. Lets set
the "forbidden" settings zu zero and keep only the allowed ones.
Change-Id: I4a481def59e9c98cfdcafc2b80c0ac7df0c14130

gsm0808: add function to convert amr gsm0408 setings to gsm0808
Add a function to convert struct gsm48_multi_rate_conf, which holds the
codec settings for AMR, to S0-S15 bit representation as defined in 3GPP
TS 48.008 3.2.2.49
Change-Id: I4e656731b16621736c7a2f4e64d9ce63b1064e98 Related: OS#3548