MIPS: Restore init.h usage to arch/mips/ar7/time.c

Commit 0046be10e0c502705fc74d91408eba13a73bc201 ("mips: delete
non-required instances of include <linux/init.h>") inadvertently
removed an include that was actually correct. Restore it.

Note that it gets init.h implicitly anyway, so this is largely a
cosmetic fixup; no build regressions were caused by this.

Signed-off-by: Paul Gortmaker <[e-mail]>
Cc: John Crispin <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/6416/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/ar7/time.c

···
  * Setting up the clock on the MIPS boards.
  */
 
+#include <linux/init.h>
 #include <linux/time.h>
 #include <linux/err.h>
 #include <linux/clk.h>