L-MR1 specific fixes

 Reset soinfo version to 0.
 Disable ifunc test for arm64 because of old toolchain
 in lmp-mr1-dev branch

 Note: this commit should be reverted in -plus-aosp branch.

Change-Id: I2d6d996d43bc35d5d4975c745779f43a988b31e6
diff --git a/linker/linker.h b/linker/linker.h
index 37d513e..3abab29 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -89,7 +89,7 @@
 #define FLAG_LINKER     0x00000010 // The linker itself
 #define FLAG_NEW_SOINFO 0x40000000 // new soinfo format
 
-#define SOINFO_VERSION 1
+#define SOINFO_VERSION 0
 
 #define SOINFO_NAME_LEN 128