mmc: cmdq_hci: Add tracing events for CQ mode.

Add ring buffer tracing events in CQ for
debugging purpose. Tracing events includes
cpu, timestamp, CQ metadata per tag(task
descripter, tag, CQIS ,halt-unhalt,
enable-disable).

Example:
<6> 1211721243963: cmdq_request : tag: 0
<6> 1211721856723: cmdq_irq: mmc0: CQIS: 0x2 err: 0
<6> 1211721863286: cmdq_irq: mmc0: completing tag -> 0
<6> 1211722496046: cmdq_prep_dcmd_desc: mmc0: DCMD:
Task: 0x0163402f | Args: 0x015f2538
<6> 1211722505994: cmdq_request : tag: 31
<6> 1211722538025: cmdq_irq: mmc0: CQIS: 0x2 err: 0
<6> 1211722544588: cmdq_irq: mmc0: completing tag -> 31

Change-Id: I7642bfc33513fa6b09da03220fd4dd12f47bbac5
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>