microblaze: remove an empty file arch/microblaze/lib/time.c

Commit 779bf42c moved timer functions from
arch/microblaze/lib/time.c to arch/microblaze/cpu/timer.c.

But the empty file, arch/microblaze/lib/time.c
has been remaining probably for a human mistake.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/lib/time.c b/arch/microblaze/lib/time.c
deleted file mode 100644
index e69de29..0000000
--- a/arch/microblaze/lib/time.c
+++ /dev/null