boards/sipeed-longan-nano-tft: add board definition for the TFT version

This commit introduces a separate board definition based on the `sipeed-longan-nano` board definition for the TFT version of the Sipeed Longan Nano board.

boards/sipeed-longan-nano-tft/Kconfig

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+# Copyright (c) 2023 Gunar Schorcht
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+config BOARD
+    default "sipeed-longan-nano-tft" if BOARD_SIPEED_LONGAN_NANO_TFT
+
+config BOARD_SIPEED_LONGAN_NANO_TFT
+    bool
+    default y
+    select CPU_MODEL_GD32VF103CBT6
+    select BOARD_HAS_HXTAL
+    select BOARD_HAS_LXTAL
+    select HAS_HIGHLEVEL_STDIO
+    select HAS_PERIPH_ADC
+    select HAS_PERIPH_DAC
+    select HAS_PERIPH_I2C
+    select HAS_PERIPH_PWM
+    select HAS_PERIPH_SPI
+    select HAS_PERIPH_TIMER
+    select HAS_PERIPH_UART
+    select HAS_PERIPH_USBDEV
+    select HAS_RIOTBOOT
+    select HAS_TINYUSB_DEVICE
+
+    select HAVE_MTD_SDCARD_DEFAULT
+    select HAVE_SAUL_GPIO
+    select HAVE_ST7735
+
+    select MODULE_FATFS_VFS if MODULE_VFS_DEFAULT
+    select MODULE_USB_BOARD_RESET if KCONFIG_USB && TEST_KCONFIG
+
+config FORCE_USB_STDIO
+    default y
+
+source "$(RIOTBOARD)/common/gd32v/Kconfig"

boards/sipeed-longan-nano-tft/Makefile

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+DIRS = $(RIOTBOARD)/sipeed-longan-nano
+include $(RIOTBASE)/Makefile.base

boards/sipeed-longan-nano-tft/Makefile.dep

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+ifneq (,$(filter disp_dev,$(USEMODULE)))
+  USEMODULE += st7735
+endif
+
+include $(RIOTBOARD)/sipeed-longan-nano/Makefile.dep

boards/sipeed-longan-nano-tft/Makefile.features

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+include $(RIOTBOARD)/sipeed-longan-nano/Makefile.features

boards/sipeed-longan-nano-tft/Makefile.include

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+INCLUDES += -I$(RIOTBOARD)/sipeed-longan-nano/include
+include $(RIOTBOARD)/sipeed-longan-nano/Makefile.include

boards/sipeed-longan-nano-tft/doc.txt

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+/**
+@defgroup   boards_sipeed_longan_nano_tft Sipeed Longan Nano with TFT
+@ingroup    boards
+@brief      Support for the Sipeed Longan Nano board with TFT display
+@author     Gunar Schorcht <gunar@schorcht.net>
+
+The [Sipeed Longan Nano TFT](https://longan.sipeed.com/en) board is a version
+of the \ref sipeed_longan_nano "Sipeed Longan Nano" development board
+that is equipped with a TFT display with the following on-board components:
+
+- GD32VF103CBT6 RISC-V MCU @108MHz
+- USB Type C
+- TF card slot
+- 3 user LEDs
+- 0.96" TFT display 160 x 80 pixel
+
+@image html "https://media-cdn.seeedstudio.com/media/catalog/product/cache/7f7f32ef807b8c2c2215b49801c56084/1/1/114992425_1.jpg" "Sipeed Longan Nano" width=600
+
+Detailed information about the board configuration and flashing can be found
+in the \ref sipeed_longan_nano "Sipeed Longan Nano" documentation.
+*/