can: tcan4x5x: get rid of false clock errors

tcan4x5x devices only requires the clock "cclk", so call
devm_clk_get() directly. This is done to avoid
m_can_class_get_clocks() that checks for both hclk and cclk and
results in this warning message:

| tcan4x5x spi0.0: no clock found

Signed-off-by: Sean Nyekjaer <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>

Author: sknsean

drivers/net/can/m_can/tcan4x5x-core.c

@@ -409,7 +409,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 		priv->power = NULL;
 	}
 
-	m_can_class_get_clocks(mcan_class);
+	mcan_class->cclk = devm_clk_get(mcan_class->dev, "cclk");
 	if (IS_ERR(mcan_class->cclk)) {
 		dev_err(&spi->dev, "no CAN clock source defined\n");
 		freq = TCAN4X5X_EXT_CLK_DEF;