arch/arm/src/stm32f7: remove duplicated stm32_exti_alarm.c source entry

stm32_exti_alarm.c was added twice in Make.defs and CMakeLists.txt: once
in the main CONFIG_STM32_RTC block and again in a second redundant
CONFIG_STM32_RTC/CONFIG_RTC_ALARM block.  Drop the duplicate block;
this bug also exists upstream.

Signed-off-by: raiden00pl <raiden00@railab.me>

Author: raiden00pl

arch/arm/src/stm32f7/CMakeLists.txt

@@ -126,12 +126,6 @@ if(CONFIG_STM32_QSPI)
   list(APPEND SRCS stm32_qspi.c)
 endif()
 
-if(CONFIG_STM32_RTC)
-  if(CONFIG_RTC_ALARM)
-    list(APPEND SRCS stm32_exti_alarm.c)
-  endif()
-endif()
-
 if(CONFIG_STM32_ETHMAC)
   list(APPEND SRCS stm32_ethernet.c)
 endif()

arch/arm/src/stm32f7/Make.defs

@@ -127,12 +127,6 @@ ifeq ($(CONFIG_STM32_QSPI),y)
 CHIP_CSRCS += stm32_qspi.c
 endif
 
-ifeq ($(CONFIG_STM32_RTC),y)
-ifeq ($(CONFIG_RTC_ALARM),y)
-CHIP_CSRCS += stm32_exti_alarm.c
-endif
-endif
-
 ifeq ($(CONFIG_STM32_ETHMAC),y)
 CHIP_CSRCS += stm32_ethernet.c
 endif