@mjchen1
mjchen1 modify macro UART_WAIT_TX_EMPTY to check Tx FIFO and shift register
101e6f3 Nov 26, 2020
modify macro UART_WAIT_TX_EMPTY to check Tx FIFO and shift register 
Change-Id: I982169a411315ee9c3f44ac20663e8bd62ae87fc
101e6f3