spi: dw-mmio: keep old name same as documentation

The documentation has not use the new name(host/target),
so keep the comment words same as documentation used.

Signed-off-by: Yang Yingliang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-dw-mmio.c

···
 		((((val) << 1) | BIT(0)) << ELBA_SPICS_OFFSET(cs))
 
 /*
- * The Designware SPI controller (referred to as host in the documentation)
+ * The Designware SPI controller (referred to as master in the documentation)
  * automatically deasserts chip select when the tx fifo is empty. The chip
  * selects then needs to be either driven as GPIOs or, for the first 4 using
  * the SPI boot controller registers. the final chip select is an OR gate
···
 }
 
 /*
- * The Designware SPI controller (referred to as host in the
+ * The Designware SPI controller (referred to as master in the
  * documentation) automatically deasserts chip select when the tx fifo
  * is empty. The chip selects then needs to be driven by a CS override
  * register. enable is an active low signal.