drivers/spi: store detected flash IDs

Change-Id: I36de9ba6c5967dddd08a71a522cf680d6e146fae
Signed-off-by: Stefan Tauner <stefan.tauner@gmx.at>
Reviewed-on: https://review.coreboot.org/c/28347
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/spi_flash.h

@@ -89,6 +89,8 @@ struct spi_flash_ops {
 
 struct spi_flash {
 	struct spi_slave spi;
+	u8 vendor;
+	u16 model;
 	const char *name;
 	u32 size;
 	u32 sector_size;