1.Fix a typo in DevicePath Driver

2.Fix a bug in EBC, the periodic callback timer should be 1s
3.Add a dependency file for DriverSample in UI since it consume EFI_SIMPLE_TEXT_OUT protocol.
4.Fix a memory allocation defects in DriverSample.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2227 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Universal/DevicePath/Dxe/DevicePathFromText.c

@@ -510,7 +510,7 @@ TrimHexStr (
     Str += 1;
   }
   //
-  // skip preceeding white space
+  // skip preceeding character 'x' or 'X'
   //
   if (*Str && (*Str == 'x' || *Str == 'X')) {
     Str += 1;