remove old openh743i, explicitly disable systick when using freertos for H7

hw/bsp/stm32h7/boards/waveshare_openh743i/board.mk

@@ -0,0 +1,19 @@
+CFLAGS += -DSTM32H743xx -DHSE_VALUE=8000000
+
+# Default is HS port
+PORT ?= 1
+
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32h743xx.s
+LD_FILE = $(BOARD_PATH)/STM32H743IITX_FLASH.ld
+
+# Use Timer module for ULPI PHY reset
+CFLAGS += -DHAL_TIM_MODULE_ENABLED
+SRC_C += \
+  $(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_tim.c \
+  $(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_tim_ex.c
+
+# For flash-jlink target
+JLINK_DEVICE = stm32h743ii
+
+# flash target using jlink
+flash: flash-jlink