clocksource/drivers/stm32-lp: Drop unused module alias

The driver cannot be built as a module so drop the unused platform
module alias.

Note that platform aliases are not needed for OF probing should it ever
become possible to build the driver as a module.

Signed-off-by: Johan Hovold <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/clocksource/timer-stm32-lp.c

···
 };
 module_platform_driver(stm32_clkevent_lp_driver);
 
-MODULE_ALIAS("platform:stm32-lptimer-timer");
 MODULE_DESCRIPTION("STMicroelectronics STM32 clockevent low power driver");