RMCP+ login support with privilege

Implementation of RMCP login support with appropriate
privilege level.

Unit Test:
1. Verified that user is able to login without any issues
2. Privilege of the user is minimum of requested, user & channel
3. Unable to set higher privilege using Set session commands

Change-Id: I5e9ef21dfc1f1b50aa815562a3a65d90c434877c
Signed-off-by: Richard Marian Thomaiyar <richard.marian.thomaiyar@linux.intel.com>
diff --git a/command/rakp12.hpp b/command/rakp12.hpp
index 1ce533a..95124be 100644
--- a/command/rakp12.hpp
+++ b/command/rakp12.hpp
@@ -10,6 +10,9 @@
 
 constexpr size_t userNameMaxLen = 16;
 
+constexpr uint8_t userNameOnlyLookupMask = 0x10;
+constexpr uint8_t userNameOnlyLookup = 0x10;
+
 /**
  * @struct RAKP1request
  *