Some more build fixes

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Framework/GridMate/Platform/Android/GridMate/Carrier/Utils_Android.cpp

@@ -18,9 +18,9 @@
 
 namespace GridMate
 {
-    string Utils::GetMachineAddress(int familyType)
+    AZStd::string Utils::GetMachineAddress(int familyType)
     {
-        string machineName;
+        AZStd::string machineName;
         struct RTMRequest
         {
             nlmsghdr m_msghdr;

Code/Framework/GridMate/Platform/Linux/GridMate/Session/LANSession_Linux.cpp

@@ -8,6 +8,8 @@
 
 #include <unistd.h>
 
+#include <AzCore/std/string/string.h>
+
 namespace GridMate
 {
     namespace Platform

Code/Framework/GridMate/Platform/Mac/GridMate/Session/LANSession_Mac.cpp

@@ -8,6 +8,8 @@
 
 #include <unistd.h>
 
+#include <AzCore/std/string/string.h>
+
 namespace GridMate
 {
     namespace Platform