wb_spi: loosing first bit during first transfer
wb_spi: loosing first bit during first transfer when tx_negate=1 and rx_negate=0 (CPOL=0,CPHA=0)
Steps to reproduce bug:
write 0x00000004 to 0x00000014 (divider)
write 0x00000001 to 0x00000018 (slave select)
write 0x000000FF to 0x00000000 (data0)
write 0x00000508 to 0x00000010 (ctrl)
Wait for end of transfer
write 0x000000FF to 0x00000000 (data0)
write 0x00000508 to 0x00000010 (ctrl)
