nucleo-l476rg: fix ADC driver compilation

The definition of ADC channels should not depend on option
CONFIG_INPUT_AJOYSTICK at all. Moreover, the include of stm32l4_adc.h
file was missing (PWM include was used instead), causing the implicit
declaration of stm32l4_adc_initialize function.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>

boards/arm/stm32l4/nucleo-l476rg/src/stm32_adc.c

@@ -35,7 +35,7 @@
 
 #include "chip.h"
 #include "arm_internal.h"
-#include "stm32l4_pwm.h"
+#include "stm32l4_adc.h"
 #include "nucleo-l476rg.h"
 
 #ifdef CONFIG_STM32L4_ADC1
@@ -58,7 +58,6 @@
 
 /* Identifying number of each ADC channel. */
 
-#ifdef CONFIG_INPUT_AJOYSTICK
 #ifdef CONFIG_ADC_DMA
 /* The Itead analog joystick gets inputs on ADC_IN1 and ADC_IN2 */
 
@@ -94,7 +93,6 @@ static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS]  =
 };
 
 #endif /* CONFIG_ADC_DMA */
-#endif /* CONFIG_INPUT_AJOYSTICK */
 
 /****************************************************************************
  * Private Functions