nvme-cli: Decode "Supported Events Bitmap" in PEL header

nvme-cli: Decode "Supported Events Bitmap" in PEL header

"Supported Events Bitmap" in PEL header shows what events
are supported in current nvme devices.

Persistent Event Log for device: nvme0n1
Action for Persistent Event Log: 0
..
..
..
Supported Events Bitmap:
        Support SMART/Health Log Snapshot Event(0x1)
        Support Firmware Commit Event(0x2)
        Support Timestamp Change Event(0x3)
        Support Power-on or Reset Event(0x4)
        Support NVM Subsystem Hardware Error Event(0x5)
        Support Change Namespace Event(0x6)
        Support Format NVM Start Event(0x7)
        Support Format NVM Completion Event(0x8)
        Support Sanitize Start Event(0x9)
        Support Sanitize Completion Event(0xa)
        Support Set Feature Event(0xb)
        Support Set Telemetry CRT  Event(0xc)
        Support Thermal Excursion Event(0xd)

Signed-off-by: Wen Xiong <wenxiong@linux.ibm.com>