pseries: Update SLOF firmware image

This adds tcgbios (this was posted earlier [1] but got lost)
and fixes FDT update at ibm,client-architecture-support
for huge guests.

The full list of changes:

Alexey Kardashevskiy (4):
      make: Define default rule for .c when V=1 or V=2
      version: update to 20200513
      fdt: Avoid recursion when traversing tree
      version: update to 20200717

Gustavo Romero (1):
      board-qemu: Fix comment about SLOF start address

Stefan Berger (6):
      tcgbios: Only write logs for PCRs that are allocated
      tcgbios: Fix the vendorInfoSize to be of type uint8_t
      tcgbios: Add support for SHA3 type of algorithms
      elf: Implement elf_get_file_size to determine size of an ELF image
      tcgbios: Implement tpm_hash_log_extend_event_buffer
      tcgbios: Measure the bootloader file read from disk

[1] https://patchwork.ozlabs.org/project/qemu-devel/patch/20200513024355.121476-1-aik@ozlabs.ru/

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pc-bios/README

@@ -14,7 +14,7 @@
 - SLOF (Slimline Open Firmware) is a free IEEE 1275 Open Firmware
   implementation for certain IBM POWER hardware.  The sources are at
   https://github.com/aik/SLOF, and the image currently in qemu is
-  built from git tag qemu-slof-20200327.
+  built from git tag qemu-slof-20200717.
 
 - sgabios (the Serial Graphics Adapter option ROM) provides a means for
   legacy x86 software to communicate with an attached serial console as

roms/SLOF

@@ -1 +1 @@
-Subproject commit 8e012d6fddb62be833d746cef3f03e6c8beecde0
+Subproject commit e18ddad8516ff2cfe36ec130200318f7251aa78c