sparc: Add module.h to files previously implicitly using it.

The file mm/extable.c needs module.h for within_module_init(), and
also for search_exception_tables [which arguably could be living somewhere
more appropriate than module.h] - eventually causing this:

arch/sparc/mm/extable.c: In function 'trim_init_extable':
arch/sparc/mm/extable.c:74: error: dereferencing pointer to incomplete type
arch/sparc/mm/extable.c:75: error: dereferencing pointer to incomplete type
arch/sparc/mm/extable.c:77: error: implicit declaration of function 'within_module_init'
arch/sparc/mm/extable.c:77: error: dereferencing pointer to incomplete type
arch/sparc/mm/extable.c:78: error: dereferencing pointer to incomplete type
arch/sparc/mm/extable.c:80: error: dereferencing pointer to incomplete type
arch/sparc/mm/extable.c: In function 'search_extables_range':
arch/sparc/mm/extable.c:93: error: implicit declaration of function 'search_exception_tables'

The other instances are more straight forward uses of things
like MODULE_* and module_*

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

arch/sparc/kernel/apc.c

@@ -13,6 +13,7 @@
 #include <linux/pm.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/oplib.h>

arch/sparc/kernel/pmc.c

@@ -11,6 +11,7 @@
 #include <linux/pm.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/oplib.h>

arch/sparc/mm/extable.c

@@ -2,6 +2,7 @@
  * linux/arch/sparc/mm/extable.c
  */
 
+#include <linux/module.h>
 #include <asm/uaccess.h>
 
 void sort_extable(struct exception_table_entry *start,