libm: rename LIBC_PRIVATE to LIBC_DEPRECATED

Bug: http://b/26386014
Change-Id: Ia32411ce779f9dcf2cf7910d8658ffa753c73af9
(cherry picked from commit 9296460bf4dc64d91a83032c8323816430048419)
diff --git a/libm/libm.arm.map b/libm/libm.arm.map
index e781f2d..842f46c 100644
--- a/libm/libm.arm.map
+++ b/libm/libm.arm.map
@@ -272,7 +272,7 @@
     *;
 };
 
-LIBC_PRIVATE { # arm mips
+LIBC_DEPRECATED { # arm mips
   global: # arm mips
     ___Unwind_Backtrace; # arm
     ___Unwind_ForcedUnwind; # arm
diff --git a/libm/libm.map.txt b/libm/libm.map.txt
index 075ebd5..d273603 100644
--- a/libm/libm.map.txt
+++ b/libm/libm.map.txt
@@ -271,7 +271,7 @@
     *;
 };
 
-LIBC_PRIVATE { # arm mips
+LIBC_DEPRECATED { # arm mips
   global: # arm mips
     ___Unwind_Backtrace; # arm
     ___Unwind_ForcedUnwind; # arm
diff --git a/libm/libm.mips.map b/libm/libm.mips.map
index 476c6ad..2429dba 100644
--- a/libm/libm.mips.map
+++ b/libm/libm.mips.map
@@ -272,7 +272,7 @@
     *;
 };
 
-LIBC_PRIVATE { # arm mips
+LIBC_DEPRECATED { # arm mips
   global: # arm mips
     __fixdfdi; # arm mips
     __fixsfdi; # arm mips