Use AESNI=y only on x86_64 machines

This fixes the native build on arm64 machines.

Change-Id: I89bff01beedb4c8e26ac55fab2dd1ed39754bf26
Signed-off-by: Brian Brooks <brian.brooks@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
diff --git a/Makefile b/Makefile
index aef879c..c43612d 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,13 @@
 GDB?=gdb
 PLATFORM?=vpp
 SAMPLE_PLUGIN?=no
+MACHINE=$(shell uname -m)
+
+ifeq ($(MACHINE),$(filter $(MACHINE),x86_64))
 export AESNI?=y
+else
+export AESNI?=N
+endif
 
 ,:=,
 define disable_plugins