Bluetooth: CAP: Add minimum metadata len req for CAP

CAP requires setting the streaming context in the metadata,
which requires 4 octets of metadata, so the metadata for
CAP must be greater than or equal to 4.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

subsys/bluetooth/audio/Kconfig.cap

@@ -11,6 +11,7 @@ config BT_CAP
 config BT_CAP_ACCEPTOR
  bool "Common Audio Profile Acceptor Role Support [EXPERIMENTAL]"
  depends on BT_BAP_UNICAST_SERVER || (BT_BAP_BROADCAST_SINK && BT_BAP_SCAN_DELEGATOR)
+ depends on BT_AUDIO_CODEC_CFG_MAX_METADATA_COUNT >= 4
  select EXPERIMENTAL
  help
  Enabling this will enable the CAP Acceptor role. This instantiates the
@@ -30,6 +31,7 @@ config BT_CAP_ACCEPTOR_SET_MEMBER
 config BT_CAP_INITIATOR
  bool "Common Audio Profile Initiator Role Support [EXPERIMENTAL]"
  depends on (BT_BAP_UNICAST_CLIENT && BT_CSIP_SET_COORDINATOR) || BT_BAP_BROADCAST_SOURCE
+ depends on BT_AUDIO_CODEC_CFG_MAX_METADATA_COUNT >= 4
  select EXPERIMENTAL
  help
  Enabling this will enable the CAP Initiator role.