MIPS: generic: Include asm/time.h for get_c0_*_int()

arch/mips/generic/irq.c provides implementations of the
get_c0_compare_int() & get_c0_perfcount_int() functions, but doesn't
include the asm/time.h header which declares them. This leads to
warnings from sparse:

  arch/mips/generic/irq.c:36:5: warning: symbol 'get_c0_perfcount_int'
    was not declared. Should it be static?
  arch/mips/generic/irq.c:52:14: warning: symbol 'get_c0_compare_int'
    was not declared. Should it be static?

Fix this by including asm/time.h to get the declarations of
get_c0_compare_int() & get_c0_perfcount_int().
Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: trivial@kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17167/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/generic/irq.c

@@ -16,6 +16,7 @@
 #include <linux/types.h>
 
 #include <asm/irq.h>
+#include <asm/time.h>
 
 int get_c0_fdc_int(void)
 {