pwm: lpss: Move exported symbols to PWM_LPSS namespace

Avoid unnecessary pollution of the global symbol namespace by
moving library functions in to a specific namespace and import
that into the drivers that make use of the functions.

For more info: https://lwn.net/Articles/760045/Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-lpss-pci.c

@@ -92,3 +92,4 @@ module_pci_driver(pwm_lpss_driver_pci);
 
 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(PWM_LPSS);

drivers/pwm/pwm-lpss-platform.c

@@ -88,4 +88,5 @@ module_platform_driver(pwm_lpss_driver_platform);
 
 MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(PWM_LPSS);
 MODULE_ALIAS("platform:pwm-lpss");

drivers/pwm/pwm-lpss.c

@@ -18,6 +18,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/time.h>
 
+#define DEFAULT_SYMBOL_NAMESPACE PWM_LPSS
+
 #include "pwm-lpss.h"
 
 #define PWM				0x00000000