fix taihu soft spi_read

The taihu board used gpio_read_out_bit which reads the output register and not the pin state.

---

The function gpio_read_out_bit didn't exist in u-boot <= 1.3.1 so every usage of gpio_read_out_bit deserves a closer look.

index ea83671..eedde59 100644
@@ -162,7 +162,7 @@ void spi_sda(int bit)
 
 unsigned char spi_read(void)
 {
-       return (unsigned char)gpio_read_out_bit(SPI_DIN_GPIO15);
+       return (unsigned char)gpio_read_in_bit(SPI_DIN_GPIO15);
 }
 
 void taihu_spi_chipsel(int cs)

Applied to u-boot-ppc4xx custodian repository. Will get pulled into 1.3.2 release. Thanks.

Best regards,
Stefan

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