keystone2: spi: do not define DM_SPI and DM_SPI_FLASH for SPL build

Since Keystone2 devices do not have support DM in SPL, do not define
DM_SPI and DM_SPI_FLASH for SPL build.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
1 file changed