microblaze: Remove ipc.h file which points to non-existing asm-generic file

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/ipc.h b/arch/microblaze/include/asm/ipc.h
deleted file mode 100644
index a46e3d9..0000000
--- a/arch/microblaze/include/asm/ipc.h
+++ /dev/null
@@ -1 +0,0 @@
-#include <asm-generic/ipc.h>