integrating 1.14 lcd waveshare module with nrf5340dk

Hi, I am new to working  on the display . I am trying to integrate  nrf5340dk board with waveshare lcd module  which is of 1.14 inch and has st7789v controller by using SPI communication protocol. I want to display something on the lcd module . i have made hardware connections as mentioned below 

i came across the example under samples/drivers/display. I have build that project . iam getting error because device dt api 

display_dev = DEVICE_DT_GET(DT_CHOSEN (zephyr_display));. i need to know why this giving me error . and how to create the overlay file for this. i have driver of st7789v when i tried to  write overlay file iam getting. please let me know how to overcome this. and there is a c source file and header file for st7789v driver under drivers sections drivers/display/st7789v how to make use of that.or how to integrate it with my code . and  what spi bus should i use for this. I have also gone through the sample of  display integartion in the dev academy. 
please help me  with that . thank you in  advance 

SPI CONNECTIONS
NRF5340dk lcd module waveshare
vdd vcc
gnd gnd
p1.13 mosi(din)
p1.15 clk(sck)
p0.11 cs
p1.11 dc
p1.10 rst
vdd bl
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