[SQUASH ME] removed SPI_PORT_CLK_DIS
[SQUASH ME] removed some includes from spi.c
[SQUASH ME] removed gpio test case
[SQUASH ME] renamed callback array
[]SQUASH ME] added speed parameter in switch case
[SQUASH ME] return  error when choosen  spi speed value is not defined
[SQUASH ME] deleted waiting in ISR
[SQUASH ME] gaurd isr_spiX
[SQUASH ME] deleted nrf-stuff in main
[SQUASH ME] deleted board specific printfs
[SQUASH ME] changed name of cb function in main
changed interrupt bevhavior of slave on cs low. now in application
[SQUASH ME] added 100khz speed case and return error then