package/bluez5_utils: make a single option for avrcp and a2dp

package/bluez5_utils: make a single option for avrcp and a2dp

Build of avrcp without a2dp is broken since commit
fb9fc969d91f69851b4c70dba512b607e52bda7b:

/home/buildroot/autobuild/run/instance-3/output-1/host/opt/ext-toolchain/bin/../lib/gcc/x86_64-buildroot-linux-uclibc/9.3.0/../../../../x86_64-buildroot-linux-uclibc/bin/ld: profiles/audio/bluetoothd-avrcp.o: in function `avrcp_handle_set_volume':
avrcp.c:(.text+0x9c4): undefined reference to `media_transport_update_device_volume'

However, build of a2dp without avrcp is also broken:

/data/buildroot-autobuilder/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/riscv32-buildroot-linux-gnu/10.2.0/../../../../riscv32-buildroot-linux-gnu/bin/ld: profiles/audio/bluetoothd-media.o: in function `.L50':
media.c:(.text+0x508): undefined reference to `avrcp_unregister_player'
/data/buildroot-autobuilder/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/riscv32-buildroot-linux-gnu/10.2.0/../../../../riscv32-buildroot-linux-gnu/bin/ld: profiles/audio/bluetoothd-media.o: in function `match_endpoint_by_path':
media.c:(.text+0x824): undefined reference to `avrcp_register_player'

Fixes:
 - http://autobuild.buildroot.org/results/d54cdfc03212fff772a863d1bc8afd3cfb605831
 - http://autobuild.buildroot.org/results/64d75af986a4d6e9c5a176efb6e22046f4d82350

So make a single audio option for a2dp and avrcp

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>