kconfig: Remove redundant SPI_DW dep on SPI_DW_ACCESS_WORD_ONLY

This symbol is already defined within an 'if SPI_DW'.

Flagged by zephyrproject-rtos/ci-tools#128.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

Author: ulfalizer

drivers/spi/Kconfig.dw

@@ -34,7 +34,6 @@ config SPI_DW_FIFO_DEPTH
 
 config SPI_DW_ACCESS_WORD_ONLY
 	bool "DesignWare SPI only allows word access"
-	depends on SPI_DW
 	help
 	  In some case, e.g. ARC HS Development kit, the peripheral space of
 	  DesignWare SPI only allows word access, byte access will raise