DynamicTablesPkg: Enable RISCV64 package build coverage

Add RISCV64 to the package's supported architectures and include the
FDT parser in its RISC-V components. This lets the package compiler
checks exercise the RISC-V parser and table generators instead of
silently excluding them.

Keep the parser limited to AARCH64 and RISCV64, the architectures
for which it implements a dispatcher.

Address the uninitialized-value warnings exposed by the RISCV64 GCC
build without disabling warnings:
- Return success after grouping CM objects and generating PCI slots.
- Initialize the DBG2 cleanup result when there are no SSDT tables.
- Initialize the SMBIOS Type 7 cleanup count before allocations.
- Initialize the four affected SMBIOS Type 42 CM object pointers.
- Assign RHCT section and PPTT cache offsets before their count checks.

These changes accompany the HMAT and PLIC/APLIC fixes earlier in the
series so both DEBUG and RELEASE package builds succeed with -Werror.

Signed-off-by: Djordje Nedic <djordje.nedic@nextsilicon.com>

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