fix sh ptep_get_and_clear breakage

Commit 1ea0704e
(mm: add a ptep_modify_prot transaction abstraction)
triggered on sh build errors like the following:

<--  snip  -->

...
  CC      arch/sh/mm/pg-sh4.o
cc1: warnings being treated as errors
include2/asm/pgtable.h:139: error: 'ptep_get_and_clear' declared inline after being called
include2/asm/pgtable.h:139: error: previous declaration of 'ptep_get_and_clear' was here
make[2]: *** [arch/sh/mm/pg-sh4.o] Error 1

<--  snip  -->

Since there's no good reason for marking these global functions as
"inline" this patch therefore removes the inline's.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>