unicore: Remove ELF_MACHINE from cpu.h

The only generic code relying on this is linux-user, but linux users'
default behaviour of defaulting ELF_MACHINE to ELF_ARCH will handle
this.

This removes another architecture specific definition from the global
namespace.

Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Acked-By: NRiku Voipio <riku.voipio@linaro.org>
Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

target-unicore32/cpu.h

@@ -17,8 +17,6 @@
 #define TARGET_PHYS_ADDR_SPACE_BITS     32
 #define TARGET_VIRT_ADDR_SPACE_BITS     32
 
-#define ELF_MACHINE             EM_UNICORE32
-
 #define CPUArchState                struct CPUUniCore32State
 
 #include "config.h"