ACPI / LPSS: register clock device for Lynxpoint DMA properly

The DMA controller in Lynxpoint is enumerated as a regular ACPI device now. To
work properly it is using the LPSS root clock as a functional clock. That's why
we have to register the clock device accordingly to the ACPI ID of the DMA
controller. The acpi_lpss.c module is responsible to do the job.

This patch also removes hardcoded name of the DMA device in clk-lpt.c and the
name of the root clock in acpi_lpss.c.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

include/linux/platform_data/clk-lpss.h

@@ -13,6 +13,11 @@
 #ifndef __CLK_LPSS_H
 #define __CLK_LPSS_H
 
+struct lpss_clk_data {
+	const char *name;
+	struct clk *clk;
+};
+
 extern int lpt_clk_init(void);
 
 #endif /* __CLK_LPSS_H */