global: Add <linux/string.h> instead of long indirect include path

In a number of cases we have C files which rely on a chain of indirect
include paths to get <linux/string.h> to be included via <command.h>. To
facilitate cleaning up <command.h> make this code directly include
<linux/string.h>.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-uniphier/dram/cmd_ddrmphy.c b/arch/arm/mach-uniphier/dram/cmd_ddrmphy.c
index 629f8b9..be4ce32 100644
--- a/arch/arm/mach-uniphier/dram/cmd_ddrmphy.c
+++ b/arch/arm/mach-uniphier/dram/cmd_ddrmphy.c
@@ -9,6 +9,7 @@
 #include <linux/io.h>
 #include <linux/printk.h>
 #include <linux/sizes.h>
+#include <linux/string.h>
 
 #include "../soc-info.h"
 #include "ddrmphy-regs.h"
diff --git a/arch/arm/mach-uniphier/dram/cmd_ddrphy.c b/arch/arm/mach-uniphier/dram/cmd_ddrphy.c
index ca519d1..3ccafe2 100644
--- a/arch/arm/mach-uniphier/dram/cmd_ddrphy.c
+++ b/arch/arm/mach-uniphier/dram/cmd_ddrphy.c
@@ -10,6 +10,7 @@
 #include <linux/io.h>
 #include <linux/printk.h>
 #include <linux/sizes.h>
+#include <linux/string.h>
 
 #include "../soc-info.h"
 #include "ddrphy-regs.h"