LE Audio: logging improvements around context type avaliability

Currently logs are split with non helpful spam. After this change, we
get a neat list of updated contexts:

UNSPECIFIED(0x0001), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
CONVERSATIONAL(0x0002), SingleDev_OneChanMonoSnk_OneChanMonoSrc_16_2_Server_Preferred -> empty
MEDIA(0x0004), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
INSTRUCTIONAL(0x0010), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
VOICEASSISTANTS(0x0020), SingleDev_OneChanMonoSnk_OneChanMonoSrc_16_2_Server_Preferred -> empty
LIVE(0x0040), SingleDev_OneChanMonoSnk_OneChanMonoSrc_16_2_Server_Preferred -> empty
SOUNDEFFECTS(0x0080), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
NOTIFICATIONS(0x0100), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
RINGTONE(0x0200), SingleDev_OneChanMonoSnk_OneChanMonoSrc_16_2_Server_Preferred -> empty
ALERTS(0x0400), SingleDev_OneChanMonoSnk_48_4_Server_Preferred -> empty
EMERGENCYALARM(0x0800), SingleDev_OneChanMonoSnk_48_4_Server_Preferred
-> empty

Test: Connect to LE audio earbuds, disconnect one earbud, connect back,
observe logs
Bug: none

Change-Id: I84c3fe6c24147ce4f2b06e4a65219937860c6c15