Update signature descriptions for NMMU_FIR[41:42]

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I9abcc922018ada57d16056938997d308e45ac7f6
diff --git a/xml/p10/node_nmmu_fir.xml b/xml/p10/node_nmmu_fir.xml
index 9f9b0ad..ec6423c 100644
--- a/xml/p10/node_nmmu_fir.xml
+++ b/xml/p10/node_nmmu_fir.xml
@@ -48,8 +48,8 @@
     <bit pos="38">Check-in sm timeout error detected</bit>
     <bit pos="39">Invalidate sm timeout error detected</bit>
     <bit pos="40">NX local checkstop error detected</bit>
-    <bit pos="41">CP0 local checkstop error detected</bit>
-    <bit pos="42">CP1 local checkstop error detected</bit>
+    <bit pos="41">fbc snoop invalidate filter parity error</bit>
+    <bit pos="42">fabric purge threshold exceeded</bit>
     <bit pos="43">NPU local checkstop error detected</bit>
     <bit pos="44">FBC local checkstop error detected</bit>
     <bit pos="45">FBC local checkstop error detected</bit>