msm: iomap: Add mappings for the MPM PS_HOLD region

A static mapping is needed for PS_HOLD for increased
robustness of the restart code, especially during a kernel
panic.

Change-Id: I616d1a27024120a4c53d8dbc524c4c38349dc704
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
diff --git a/arch/arm/mach-msm/io.c b/arch/arm/mach-msm/io.c
index a2f2c31..89964de 100644
--- a/arch/arm/mach-msm/io.c
+++ b/arch/arm/mach-msm/io.c
@@ -300,6 +300,7 @@
 	MSM_CHIP_DEVICE(QGIC_CPU, MSM8974),
 	MSM_CHIP_DEVICE(APCS_GCC, MSM8974),
 	MSM_CHIP_DEVICE(TLMM, MSM8974),
+	MSM_CHIP_DEVICE(MPM2_PSHOLD, MSM8974),
 	{
 		.virtual =  (unsigned long) MSM_SHARED_RAM_BASE,
 		.length =   MSM_SHARED_RAM_SIZE,