Fix/bt audio 48khz and suspend

[carroarmato0]

This PR stabilizes Bluetooth audio and sleep/wake behavior on tg5040/tg5050.

• Fixed BT audio failures in GBA/FBNeo when BT max rate is 48 kHz by adding a BT-only fallback for high/non-standard core rates (>48k -> 44.1k).
• Reduced GBA BT crackle by increasing audio buffer headroom for BT + high-rate cores.
• Hardened BT service startup/recovery by enabling BlueALSA keep-alive and improving tg5040 rfkill handling.
• Improved audiomon resilience by ignoring transient BlueZ disconnect events and preserving/restoring BT sink state correctly.
• Fixed deep-sleep wake hangs by guarding potentially blocking wakeup_count reads in suspend scripts.

[johnnyq]

Looks like similar work to #736

[frysee]

Looks like similar work to #736

Thats why we are merging this one into the other one :)

[johnnyq]

Gotchya @frysee that makes sense now haha