arm: dts: socfpga: Increase the spi-max-frequency for QSPI flash

arm: dts: socfpga: Increase the spi-max-frequency for QSPI flash

With a working QSPI calibration, the SCLK can now run up to 100MHz

Signed-off-by: Chin Liang See <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Vikas Manocha <[email protected]>
Cc: Jagannadh Teki <[email protected]>
Cc: Pavel Machek <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Acked-by: Marek Vasut <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>