DynamicTablesPkg: Split the ACPI and SMBIOS table generators

There are 2 changes in this commit:
1. Use ProtocolNotify Event for generating the SMBIOS and ACPI tables
   and don't include the ACPI or SMBIOS protocols in the Depex section
   for DynamicTableManagerDxe Driver.
   This is because if a platforms doesn't do ACPI based boot or if
   doesn't want to install SMBIOS tables we still want the
   DynamicTableManager to be dispatched to install the SMBIOS or ACPI
   tables respectively.
2. Split the SMBIOS and ACPI table generators into their own files.

Signed-off-by: Girish Mahadevan <[email protected]>

Author: gmahadevan