Fix the SMRAM caching range base and size. The original code uses the biggest SMRAM...

Fix the SMRAM caching range base and size. The original code uses the biggest SMRAM range base and size to set the cache attribute by gDS->SetMemorySpaceAttributes(). This is not correct because the platform code might split the TSEG into several ranges. The fix searches and joins all the adjacent ranges to the biggest SMRAM range into a cacheable range so that TSEG can be cached as a whole.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10213 6f19259b-4bc3-4df7-8a09-765794883524