[MIPS] remove some duplicate includes

This patch removes some duplicate includes from arch/mips/
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/signal32.c

@@ -18,7 +18,6 @@
 #include <linux/errno.h>
 #include <linux/wait.h>
 #include <linux/ptrace.h>
-#include <linux/compat.h>
 #include <linux/suspend.h>
 #include <linux/compiler.h>
 #include <linux/uaccess.h>

arch/mips/lemote/lm2e/irq.c

@@ -25,7 +25,6 @@
  */
 #include <linux/delay.h>
 #include <linux/io.h>
-#include <linux/irq.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>

arch/mips/mipssim/sim_setup.c

@@ -22,7 +22,6 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/ioport.h>
-#include <linux/serial.h>
 #include <linux/tty.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>