Correct IPMI firmware revision report

OpenBMC currently uses firmware revision from the VERSION parameters
from /etc/os-release. While WebUI and Redfish uses entire string for
the revision, IPMI extracts major and minor numbers from that string.
However, phosphor-host-ipmd mistakenly converts the number to
hexa-decimal which make the mismatch between Redfish and IPMI.
This commit fixes the issue by updating the conversion to use decimal
number.

Tested:
1. Tag with v1.11.0001-ampere and check ipmitool mc info report
   firmware revision to 1.11

Signed-off-by: Hieu Huynh <hieuh@os.amperecomputing.com>
Change-Id: I7340827dfc6de6664dde4b58e61197f81b4f89ca
diff --git a/apphandler.cpp b/apphandler.cpp
index a20d61a..9b76e7b 100644
--- a/apphandler.cpp
+++ b/apphandler.cpp
@@ -498,7 +498,7 @@
         if (location != std::string::npos)
         {
             rev.major =
-                static_cast<char>(std::stoi(s.substr(0, location), 0, 16));
+                static_cast<char>(std::stoi(s.substr(0, location), 0, 10));
             token = s.substr(location + 1);
         }
 
@@ -508,7 +508,7 @@
             if (location != std::string::npos)
             {
                 rev.minor = static_cast<char>(
-                    std::stoi(token.substr(0, location), 0, 16));
+                    std::stoi(token.substr(0, location), 0, 10));
                 token = token.substr(location + 1);
             }
         }