Fix backlight for F401/F411 blackpill onekey examples (#10320)

Fix configs to make the `handwired/onekey/blackpill_f401:backlight` and
`handwired/onekey/blackpill_f411:backlight` examples actually compile
and work:

 - Use `PWMD5` instead of `PWMD2` for backlight, which matches the
   default value of `BACKLIGHT_PAL_MODE` (AF02 for pin A0 is `TIM5_CH1`)
   and does not conflict with the default value of `STM32_ST_USE_TIMER`.

 - Enable `HAL_USE_PWM` in halconf.h and `STM32_PWM_USE_TIM5` in
   mcuconf.h, so that `PWMD5` could be used.

keyboards/handwired/onekey/blackpill_f401/config.h

@@ -23,7 +23,7 @@
 #define UNUSED_PINS
 
 #define BACKLIGHT_PIN           A0
-#define BACKLIGHT_PWM_DRIVER    PWMD2
+#define BACKLIGHT_PWM_DRIVER    PWMD5
 #define BACKLIGHT_PWM_CHANNEL   1
 
 #define RGB_DI_PIN A1

keyboards/handwired/onekey/blackpill_f401/halconf.h

@@ -16,5 +16,6 @@
 #pragma once
 
 #define HAL_USE_I2C TRUE
+#define HAL_USE_PWM TRUE
 
 #include_next "halconf.h"

keyboards/handwired/onekey/blackpill_f401/mcuconf.h

@@ -19,3 +19,6 @@
 
 #undef STM32_I2C_USE_I2C1
 #define STM32_I2C_USE_I2C1 TRUE
+
+#undef STM32_PWM_USE_TIM5
+#define STM32_PWM_USE_TIM5 TRUE

keyboards/handwired/onekey/blackpill_f411/config.h

@@ -23,7 +23,7 @@
 #define UNUSED_PINS
 
 #define BACKLIGHT_PIN           A0
-#define BACKLIGHT_PWM_DRIVER    PWMD2
+#define BACKLIGHT_PWM_DRIVER    PWMD5
 #define BACKLIGHT_PWM_CHANNEL   1
 
 #define RGB_DI_PIN A1

keyboards/handwired/onekey/blackpill_f411/halconf.h

@@ -16,5 +16,6 @@
 #pragma once
 
 #define HAL_USE_I2C TRUE
+#define HAL_USE_PWM TRUE
 
 #include_next "halconf.h"

keyboards/handwired/onekey/blackpill_f411/mcuconf.h

@@ -19,3 +19,6 @@
 
 #undef STM32_I2C_USE_I2C1
 #define STM32_I2C_USE_I2C1 TRUE
+
+#undef STM32_PWM_USE_TIM5
+#define STM32_PWM_USE_TIM5 TRUE