Currently dynamicEnum hook returns all available options (enums) as a
list of strings. However in some cases strings need to be converted to
target types.
One example is CPU affinity. The dynamicEnum should produce a list of
all available pCPUIDs (a list of integers), instead of a list of
strings.
This patch adds a converter in get_enum to do the type conversion.
Tracked-On: #7420
Signed-off-by: Yifan Liu <yifan1.liu@intel.com>