arm: socfpga: DW_SPI: Remove clock info from config header

Remove the now unnecessary clocking info from the SoCFPGA
config header. As this info in now used directly in the SPI driver
itself.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Vince Bridgers <vbridger@altera.com>
Cc: Marek Vasut <marex@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>

include/configs/socfpga_common.h

@@ -214,10 +214,6 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 #define CONFIG_DM
 #define CONFIG_DM_SPI
 #define CONFIG_DESIGNWARE_SPI
-#ifndef __ASSEMBLY__
-unsigned int cm_get_spi_controller_clk_hz(void);
-#define CONFIG_DW_SPI_REF_CLK		cm_get_spi_controller_clk_hz()
-#endif
 #define CONFIG_CMD_SPI
 #endif