ArmPlatformPkg/DebugSecExtraActionLib: Added Warning comment to signal the DRAM must...

ArmPlatformPkg/DebugSecExtraActionLib: Added Warning comment to signal the DRAM must be inititalized at this stage

Since the System Memory initialization has been moved inside ArmPlatformSecLib
on some platforms, the use of this library could crash if the firmware engineer
forgot to initialize the DRAM.
This library 'patches' the DRAM to add an infinite loop.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13262 6f19259b-4bc3-4df7-8a09-765794883524