3rdparty/blobs: Update submodule pointer to include latest AMD ucode

The two commits below are added to the BLOBs repository.

*   fe7c6a3 pcengines/apu2: Disable ECC Exclusion range
*   3854ad2 cpu/amd/family_15h: Add latest AMD ucode file

The latest AMD microcode patches include Spectre mitigations.

Change-Id: I4729cc054fe8267549d7369cea4d26aa51861e1c
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/27297
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/3rdparty/blobs b/3rdparty/blobs
index 78a02a7..3854ad2 160000
--- a/3rdparty/blobs
+++ b/3rdparty/blobs
@@ -1 +1 @@
-Subproject commit 78a02a7f9d979fcc864638cc40084e662476095f
+Subproject commit 3854ad29e7b767001d4f6dd93eba0d79aedda9c3