x86/platform/intel-mid: Handle Intel Edison reboot correctly

When the Intel Edison module is powered with 3.3V, the reboot command makes
the module stuck.  If the module is powered at a greater voltage, like 4.4V
(as the Edison Mini Breakout board does), reboot works OK.

The official Intel Edison BSP sends the IPCMSG_COLD_RESET message to the
SCU by default. The IPCMSG_COLD_BOOT which is used by the upstream kernel
is only sent when explicitely selected on the kernel command line.

Use IPCMSG_COLD_RESET unconditionally which makes reboot work independent
of the power supply voltage.

[ tglx: Massaged changelog ]

Fixes: bda7b07 ("x86/platform/intel-mid: Implement power off sequence")
Signed-off-by: Sebastian Panceac <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]

arch/x86/platform/intel-mid/intel-mid.c

@@ -79,7 +79,7 @@ static void intel_mid_power_off(void)
 
 static void intel_mid_reboot(void)
 {
-	intel_scu_ipc_simple_command(IPCMSG_COLD_BOOT, 0);
+	intel_scu_ipc_simple_command(IPCMSG_COLD_RESET, 0);
 }
 
 static unsigned long __init intel_mid_calibrate_tsc(void)