libm: Add Armv8.3-A PAuth and Armv8.5-A BTI support to assembly files

This change adds both Armv8.3-A Pointer Authentication and Armv8.5-A BTI
support to *.S files.

Tests: Tested on FVP with BTI enabled

Change-Id: I82750afcbc950a91584463fbc979c2c35d41916a
diff --git a/libm/arm64/lrint.S b/libm/arm64/lrint.S
index 5f95ae8..e835d08 100644
--- a/libm/arm64/lrint.S
+++ b/libm/arm64/lrint.S
@@ -32,3 +32,5 @@
 ALIAS_SYMBOL(llrint, lrint);
 
 ALIAS_SYMBOL(llrintf, lrintf);
+
+NOTE_GNU_PROPERTY()