soc/mediatek/mt8173: SPI_ATOMIC_SEQUENCING depends on SPI_FLASH

Don't select SPI_ATOMIC_SEQUENCING unless SPI_FLASH is being used.

warning: (... SOC_MEDIATEK_MT8173) selects SPI_ATOMIC_SEQUENCING
which has unmet direct dependencies (SPI_FLASH)

Change-Id: I93e9a7102d1d0ef62565110b5b3b677da8d0c72b
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12657
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/mediatek/mt8173/Kconfig

@@ -8,7 +8,7 @@ config SOC_MEDIATEK_MT8173
 	select ARCH_VERSTAGE_ARMV8_64
 	select BOOTBLOCK_CONSOLE
 	select HAVE_UART_SPECIAL
-	select SPI_ATOMIC_SEQUENCING
+	select SPI_ATOMIC_SEQUENCING if SPI_FLASH
 	select HAVE_MONOTONIC_TIMER
 	select GENERIC_UDELAY
 	select HAS_PRECBMEM_TIMESTAMP_REGION