RDS/IB: print string constants in more places

RDS/IB: print string constants in more places

This prints the constant identifier for work completion status and rdma
cm event types, like we already do for IB event types.

A core string array helper is added that each string type uses.

Note: The following is the original commit in uek prior to the big uek2
ofed blob patch.

    commit 59f740a6aeb2cde2f79fe0df38262d4c1ef35cd8

Orabug 21314268

Reviewed-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>
Signed-off-by: Qing Huang <qing.huang@oracle.com>
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Signed-off-by: Mukesh Kacker <mukesh.kacker@oracle.com>