drivers: spi: Support PM busy state where relevant in DW

Need to set device busy when enter into transceive function
in SPI DW driver.
In current SPI DW driver the transceive function don't set busy state,
but that is important for PM busy state.
This will lead to unexpected behaviors when system calls this
function and enter into idle state.

Signed-off-by: Maksim Masalski <maksim.masalski@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>