Bluetooth: btintel_pcie: Dump debug registers on error

Dumping debug registers on GP1 MSIx and error conditions, such as TX
completion timeout, aiding in understanding the controller's state
during errors. The register dump includes:
- Boot stage
- IPC control
- IPC status
- Mailbox registers

HCI traces:
= Vendor Diagnostic (len 199)
        2d 2d 2d 2d 20 44 75 6d 70 20 6f 66 20 64 65 62  ---- Dump of deb
        75 67 20 72 65 67 69 73 74 65 72 73 20 2d 2d 2d  ug registers ---
        62 6f 6f 74 20 73 74 61 67 65 3a 20 30 78 61 30  boot stage: 0xa0
        66 61 30 30 34 37 69 70 63 20 73 74 61 74 75 73  fa0047ipc status
        3a 20 30 78 30 30 30 30 30 30 30 34 69 70 63 20  : 0x00000004ipc
        63 6f 6e 74 72 6f 6c 3a 20 30 78 30 30 30 30 30  control: 0x00000
        30 30 30 69 70 63 20 73 6c 65 65 70 20 63 6f 6e  000ipc sleep con
        74 72 6f 6c 3a 20 30 78 30 30 30 30 30 30 30 30  trol: 0x00000000
        6d 62 6f 78 20 73 74 61 74 75 73 3a 20 30 78 30  mbox status: 0x0
        30 30 30 30 30 30 30 72 78 71 3a 20 63 72 5f 74  0000000rxq: cr_t
        69 61 3a 20 37 20 63 72 5f 68 69 61 3a 20 37 74  ia: 7 cr_hia: 7t
        78 71 3a 20 63 72 5f 74 69 61 3a 20 36 20 63 72  xq: cr_tia: 6 cr
        5f 68 69 61 3a 20 36                             _hia: 6

Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>