Refactoring code for boot-order configuration

Refactoring the code to use sdbusplus which has automatic conversions
for the enum types from convertTypesToString() to
sdbusplus::messsage::convert_to_string().

TESTED : Tested on Facebook Yosemitev2 platform and verified
the results

Signed-off-by: Jayashree Dhanapal <jayashree-d@hcl.com>
Change-Id: Idc84eb43f192a4ed12f414b97e48b7fb6b72628c
1 file changed