Fix libavb compilation

MLDSA support has been introduced in libavb, so compile
libavb-provided MLDSA code which always fails

Bug: 413054304
Change-Id: I4afeabc91a6b979e05f321dd4ba3d8cfeb76e3f6
Signed-off-by: Dmitrii Merkurev <dimorinny@google.com>

bootable/libbootloader

diff --git a/bootable/libbootloader b/bootable/libbootloader
index bb057a3..6ae9f4b 160000
--- a/bootable/libbootloader
+++ b/bootable/libbootloader
@@ -1 +1 @@
-Subproject commit bb057a3340c2a380f559760f93ad02dbe37927d5
+Subproject commit 6ae9f4b0bcdc94671b349e346186ad13a6d55cf6