ARM: msm: include linux/cache.h in proc_comm.c

This fixes a a build failure for 2.6.31-rc4-rt1 (ARCH=arm,
msm_defconfig):

  CC      arch/arm/mach-msm/proc_comm.o
  arch/arm/mach-msm/proc_comm.c:43: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cacheline_aligned_in_smp'
  arch/arm/mach-msm/proc_comm.c: In function 'msm_proc_comm':
  arch/arm/mach-msm/proc_comm.c:76: error: 'proc_comm_lock' undeclared (first use in this function)
  arch/arm/mach-msm/proc_comm.c:76: error: (Each undeclared identifier is reported only once
  arch/arm/mach-msm/proc_comm.c:76: error: for each function it appears in.)
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Brian Swetland <swetland@google.com>
LKML-Reference: <1249677761-19470-3-git-send-email-u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/arm/mach-msm/proc_comm.c

@@ -14,6 +14,7 @@
  *
  */
 
+#include <linux/cache.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/io.h>