kernel: add missing include to redboot.c

This fixes:
drivers/mtd/redboot.c:299:34: error: array type has incomplete element type 'struct of_device_id'

Fixes: 5e8b4be531 ("kernel: add DT binding support to the mtd redboot parser")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/generic/pending-4.9/419-mtd-redboot-add-of_match_table-with-DT-binding.patch

@@ -12,7 +12,15 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
 
 --- a/drivers/mtd/redboot.c
 +++ b/drivers/mtd/redboot.c
-@@ -289,9 +289,16 @@ static int parse_redboot_partitions(stru
+@@ -29,6 +29,7 @@
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
+ #include <linux/module.h>
++#include <linux/mod_devicetable.h>
+ 
+ struct fis_image_desc {
+     unsigned char name[16];      // Null terminated name
+@@ -289,9 +290,16 @@ static int parse_redboot_partitions(stru
  	return ret;
  }
  

target/linux/generic/pending-4.9/420-mtd-redboot_space.patch

@@ -11,7 +11,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/drivers/mtd/redboot.c
 +++ b/drivers/mtd/redboot.c
-@@ -265,14 +265,21 @@ static int parse_redboot_partitions(stru
+@@ -266,14 +266,21 @@ static int parse_redboot_partitions(stru
  #endif
  		names += strlen(names)+1;