ARM: davinci_all_defconfig: enable SPI and NOR as modules

Enable SPI driver and SPI NOR flash support as modules.

Tested with SPI NOR flash on DA850-EVM.  Basic boot test only to confirm
NOR flash device detection.

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>