[PATCH] SPI: fix build with CONFIG_SPI_FSL_ESPI=m

When spi_fsl_espi is chosen to be built as a module, there is a build
error because we test only CONFIG_SPI_FSL_ESPI in declaration of
struct mpc8xxx_spi in drivers/spi/spi_fsl_lib.h.

We need to add a test for CONFIG_SPI_FSL_ESPI_MODULE too.

The error looks like:
drivers/spi/spi_fsl_espi.c: In function 'fsl_espi_bufs':
drivers/spi/spi_fsl_espi.c:232: error: 'struct mpc8xxx_spi' has no member named 'len'
...

Signed-off-by: Jiri Slaby <redacted>
---
 drivers/spi/spi-fsl-lib.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index cbe881b..97968de 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h

@@ -28,7 +28,7 @@ struct mpc8xxx_spi {
 	/* rx & tx bufs from the spi_transfer */
 	const void *tx;
 	void *rx;
-#ifdef CONFIG_SPI_FSL_ESPI
+#if defined(CONFIG_SPI_FSL_ESPI) || defined(CONFIG_SPI_FSL_ESPI_MODULE)
 	int len;
 #endif
 

-- 
1.7.6