stm32/mboot: Remove use of BSRRL/H for H7 MCUs due to stm32lib update.

ports/stm32/mboot/mphalport.h

@@ -48,13 +48,8 @@
 #define mp_hal_pin_input(p)     mp_hal_pin_config((p), MP_HAL_PIN_MODE_INPUT, MP_HAL_PIN_PULL_NONE, 0)
 #define mp_hal_pin_output(p)    mp_hal_pin_config((p), MP_HAL_PIN_MODE_OUTPUT, MP_HAL_PIN_PULL_NONE, 0)
 #define mp_hal_pin_open_drain(p) mp_hal_pin_config((p), MP_HAL_PIN_MODE_OPEN_DRAIN, MP_HAL_PIN_PULL_NONE, 0)
-#if defined(STM32H7)
-#define mp_hal_pin_low(p)       (((GPIO_TypeDef*)((p) & ~0xf))->BSRRH = 1 << ((p) & 0xf))
-#define mp_hal_pin_high(p)      (((GPIO_TypeDef*)((p) & ~0xf))->BSRRL = 1 << ((p) & 0xf))
-#else
 #define mp_hal_pin_low(p)       (((GPIO_TypeDef*)((p) & ~0xf))->BSRR = 0x10000 << ((p) & 0xf))
 #define mp_hal_pin_high(p)      (((GPIO_TypeDef*)((p) & ~0xf))->BSRR = 1 << ((p) & 0xf))
-#endif
 #define mp_hal_pin_od_low(p)    mp_hal_pin_low(p)
 #define mp_hal_pin_od_high(p)   mp_hal_pin_high(p)
 #define mp_hal_pin_read(p)      ((((GPIO_TypeDef*)((p) & ~0xf))->IDR >> ((p) & 0xf)) & 1)