platform/x86: mlx-platform: Move module from arch/x86

Since mlx-platform is not an architectural driver, it is moved out
of arch/x86/platform to drivers/platform/x86.
Relevant Makefile and Kconfig are updated.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 1853769..4639d97 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1028,10 +1028,21 @@
 	  directly via debugfs files. Various tools may use
 	  this interface for SoC state monitoring.
 
+config MLX_PLATFORM
+	tristate "Mellanox Technologies platform support"
+	depends on X86_64
+	---help---
+	  This option enables system support for the Mellanox Technologies
+	  platform. The Mellanox systems provide data center networking
+	  solutions based on Virtual Protocol Interconnect (VPI) technology
+	  enable seamless connectivity to 56/100Gb/s InfiniBand or 10/40/56GbE
+	  connection.
+
+	  If you have a Mellanox system, say Y or M here.
+
 config MLX_CPLD_PLATFORM
 	tristate "Mellanox platform hotplug driver support"
 	default n
-	depends on MLX_PLATFORM
 	select HWMON
 	select I2C
 	---help---