microblaze: Remove empty file - cpu.c

No need to have empty unused file in architecture code.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/cpu/Makefile b/arch/microblaze/cpu/Makefile
index 4955e81..0697210 100644
--- a/arch/microblaze/cpu/Makefile
+++ b/arch/microblaze/cpu/Makefile
@@ -7,5 +7,5 @@
 
 extra-y	= start.o
 obj-y	= irq.o
-obj-y	+= cpu.o interrupts.o cache.o exception.o timer.o
+obj-y	+= interrupts.o cache.o exception.o timer.o
 obj-$(CONFIG_SPL_BUILD)	+= spl.o