edk2-stable202308: OvmfPkg/RiscVVirt: Fix issues in VarStore Blockmap config

The block size configuration of Blockmap does not match that in Qemu
VirtNorFlash, which causes variable data to be written into FtwWorkBlock
by mistake, resulting in data loss during reboot. Fix it and update
new checksum value.

Signed-off-by: Qingyu Shang <[email protected]>
Reviewed-by: Sunil V L <[email protected]>

edk2-stable202302: OvmfPkg/RiscVVirt: Add Stack HOB

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4350

Currently, stack HOB is not created for the stack memory. This causes
stack memory to be treated as free memory and any memory allocation which
happens at this address causes random memory corruption. Fix this by
creating the stack HOB which marks the memory as BS data.

Cc: Liming Gao <[email protected]>
Cc: Andrei Warkentin <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Jiewen Yao <[email protected]>
Cc: Jordan Justen <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Signed-off-by: Sunil V L <[email protected]>
Reported-by: Andrei Warkentin <[email protected]>
Tested-by: Andrei Warkentin <[email protected]>
Reviewed-by: Andrei Warkentin <[email protected]>