spi: spi-ti-qspi: Remove unused macro for fclk frequency

The fclk and its rate are retrieved from DT.
Signed-off-by: Jean Pihet <jean.pihet@newoldbits.com>
Cc: Ryan Barnett <ryan.barnett@rockwellcollins.com>
Cc: Conrad Ratschan <conrad.ratschan@rockwellcollins.com>
Cc: Arnout Vandecappelle <arnout.vandecappelle@essensium.com>
Link: https://lore.kernel.org/r/20191211193954.747745-2-jean.pihet@newoldbits.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-ti-qspi.c

@@ -79,8 +79,6 @@ struct ti_qspi {
 
 #define QSPI_COMPLETION_TIMEOUT		msecs_to_jiffies(2000)
 
-#define QSPI_FCLK			192000000
-
 /* Clock Control */
 #define QSPI_CLK_EN			(1 << 31)
 #define QSPI_CLK_DIV_MAX		0xffff