DynamicTablesPkg: Add DynamicPlatRepo library

The DynamicPlatRepo library allows to handle dynamically created
CmObj. The dynamic platform repository can be in the following states:
1 - Non-initialised
2 - Transient:
    Possibility to add CmObj to the platform, but not to query them.
3 - Finalised:
    Possibility to query CmObj, but not to add new.

A token is allocated to each CmObj added to the dynamic platform
repository (except for reference tokens CmObj). This allows to retrieve
dynamic CmObjs among all CmObj (static CmObj for instance).

This patch add the inf file of the module and the main module
functionnalities and update the dsc file of the package.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

Author: pierregondois

DynamicTablesPkg/DynamicTablesPkg.dsc

@@ -44,6 +44,7 @@
   DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.inf
   DynamicTablesPkg/Library/Common/TableHelperLib/TableHelperLib.inf
   DynamicTablesPkg/Library/FdtHwInfoParserLib/FdtHwInfoParserLib.inf
+  DynamicTablesPkg/Library/Common/DynamicPlatRepoLib/DynamicPlatRepoLib.inf
 
 [BuildOptions]
   *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES