include/spi-generic: Append unit to macro names

This patch appends a unit (milliseconds) to time-out macro names for
better understanding the code which is using the macros.

Change-Id: Ibc4beda2660a83fd5f0ed325b2ee3148c6d96639
Signed-off-by: Uwe Poeche <uwe.poeche@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34384
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/spi/atmel.c

@@ -137,7 +137,8 @@ static int atmel_write(const struct spi_flash *flash, u32 offset, size_t len,
 			goto out;
 		}
 
-		ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+		ret = spi_flash_cmd_wait_ready(flash,
+				SPI_FLASH_PROG_TIMEOUT_MS);
 		if (ret)
 			goto out;