client: Add advertise.discoverable command
This adds advertise.discoverable command which can be used to set it
own instance:
[bluetooth]# advertise.discoverable on
[bluetooth]# advertise on
@ MGMT Command: Add Advertising (0x003e) plen 14
Instance: 1
Flags: 0x00000001
Switch into Connectable mode
Duration: 0
Timeout: 0
Advertising data length: 3
Flags: 0x02
LE General Discoverable Mode
Scan response length: 0
< HCI Command: LE Set Advertising Data (0x08|0x0008) plen 32
Length: 3
Flags: 0x02
LE General Discoverable Mode
Change-Id: I664dce815fd1d6122177c4b135ecaf89f17270ff
Signed-off-by: Amit Purwar <amit.purwar@samsung.com>