msm: watchdog: make watchdog a platform device

There are now several conditionals that control how the watchdog
behaves. We have described these in terms cpu_is and machine_is macros.
Instead, convert tunables to platform data so we can keep the driver
clean.

Additionally, since it is a platform device, we can now move the
suspending code to the suspend_noirq function, which leaves the watchdog
on for more of the suspend process.

Change-Id: If47b3abbeeaa40f4e6f0f5d301d0a28efa8d3535
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-msm8x60.c b/arch/arm/mach-msm/board-msm8x60.c
index d3d5ffa..455644f 100644
--- a/arch/arm/mach-msm/board-msm8x60.c
+++ b/arch/arm/mach-msm/board-msm8x60.c
@@ -5131,6 +5131,7 @@
 #ifdef CONFIG_ION_MSM
 	&ion_dev,
 #endif
+	&msm8660_device_watchdog,
 };
 
 #ifdef CONFIG_ION_MSM