MIPS: Fixup explicit DT include clean-up

Commit 657c45b3 ("MIPS: Explicitly include correct DT includes")
removed a necessary include by mistake and missed adding an explicit
include of spinlock.h (from of.h -> kobject.h -> spinlock.h).

Fixes: 657c45b3 ("MIPS: Explicitly include correct DT includes")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/lantiq/xway/gptu.c

@@ -9,6 +9,7 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 
 #include <lantiq_soc.h>

arch/mips/pic32/pic32mzda/config.c

@@ -5,6 +5,7 @@
  */
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/spinlock.h>
 
 #include <asm/mach-pic32/pic32.h>