tests: tcg: Fix PVH test with binutils 2.36+

binutils started adding a .note.gnu.property ELF section which
makes the PVH test fail:

  TEST    hello on x86_64
qemu-system-x86_64: Error loading uncompressed kernel without PVH ELF Note

Discard .note.gnu* while keeping the PVH .note bits intact.

This also strips the build-id note, so drop the related comment.

Signed-off-by: Cole Robinson <crobinso@redhat.com>
Message-Id: <5ab2a54c262c61f64c22dbb49ade3e2db8a740bb.1633708346.git.crobinso@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 8e751e9c)
Signed-off-by: Michael Roth <michael.roth@amd.com>

tests/tcg/x86_64/system/kernel.ld

@@ -16,7 +16,10 @@ SECTIONS {
 		*(.rodata)
 	} :text
 
-        /* Keep build ID and PVH notes in same section */
+        /DISCARD/ : {
+                *(.note.gnu*)
+        }
+
         .notes :  {
                *(.note.*)
         } :note