Restore missing min and max API.

min(float2/3/4, float) and max(float2/3/4, float) were defined in our
headers in K.  In L, they were removed by mistake.  This continued to
work however because a float would be auto converted by the compiler to
a float4.

In M, we started validating for unexpected external references, which
_Z3minDv4_ff is.  This can prevent programs compiled with K from running
on M.

This CL fixes the whitelist.

Bug:23389429

Change-Id: I21f59521b3744d0c5b6fd75dbf1810493e9c1d84
(cherry picked from commit 005666078051a3f8e1e0ff59678635f3c501cde8)
diff --git a/lib/Renderscript/RSStubsWhiteList.cpp b/lib/Renderscript/RSStubsWhiteList.cpp
index b69681d..426fb43 100644
--- a/lib/Renderscript/RSStubsWhiteList.cpp
+++ b/lib/Renderscript/RSStubsWhiteList.cpp
@@ -1235,6 +1235,7 @@
 "_Z3madfff",
 "_Z3maxDv2_cS_",
 "_Z3maxDv2_fS_",
+"_Z3maxDv2_ff",
 "_Z3maxDv2_hS_",
 "_Z3maxDv2_iS_",
 "_Z3maxDv2_jS_",
@@ -1244,6 +1245,7 @@
 "_Z3maxDv2_tS_",
 "_Z3maxDv3_cS_",
 "_Z3maxDv3_fS_",
+"_Z3maxDv3_ff",
 "_Z3maxDv3_hS_",
 "_Z3maxDv3_iS_",
 "_Z3maxDv3_jS_",
@@ -1253,6 +1255,7 @@
 "_Z3maxDv3_tS_",
 "_Z3maxDv4_cS_",
 "_Z3maxDv4_fS_",
+"_Z3maxDv4_ff",
 "_Z3maxDv4_hS_",
 "_Z3maxDv4_iS_",
 "_Z3maxDv4_jS_",
@@ -1271,6 +1274,7 @@
 "_Z3maxtt",
 "_Z3minDv2_cS_",
 "_Z3minDv2_fS_",
+"_Z3minDv2_ff",
 "_Z3minDv2_hS_",
 "_Z3minDv2_iS_",
 "_Z3minDv2_jS_",
@@ -1280,6 +1284,7 @@
 "_Z3minDv2_tS_",
 "_Z3minDv3_cS_",
 "_Z3minDv3_fS_",
+"_Z3minDv3_ff",
 "_Z3minDv3_hS_",
 "_Z3minDv3_iS_",
 "_Z3minDv3_jS_",
@@ -1289,6 +1294,7 @@
 "_Z3minDv3_tS_",
 "_Z3minDv4_cS_",
 "_Z3minDv4_fS_",
+"_Z3minDv4_ff",
 "_Z3minDv4_hS_",
 "_Z3minDv4_iS_",
 "_Z3minDv4_jS_",