mips: remove <asm/export.h>

All *.S files under arch/mips/ have been converted to include
<linux/export.h> instead of <asm/export.h>.

Remove <asm/export.h>.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/Kbuild

@@ -7,7 +7,6 @@ generated-y += unistd_nr_n32.h
 generated-y += unistd_nr_n64.h
 generated-y += unistd_nr_o32.h
 
-generic-y += export.h
 generic-y += kvm_para.h
 generic-y += mcs_spinlock.h
 generic-y += parport.h