spi: imx: Fix failure path leak on GPIO request error

spi: imx: Fix failure path leak on GPIO request error

If the code that requests any chip select GPIOs fails, the cleanup of
spi_bitbang_start() by calling spi_bitbang_stop() is not done.

Fix this by moving spi_bitbang_start() to after the code that requets
GPIOs.  The GPIOs are dev managed and don't need explicit cleanup.
Since spi_bitbang_start() is now the last operation, it doesn't need
to be cleaned up in the failure path.

CC: Shawn Guo <[email protected]>
CC: Sascha Hauer <[email protected]>
CC: Fabio Estevam <[email protected]>
CC: Mark Brown <[email protected]>
Reviewed-by: Oleksij Rempel <[email protected]>
Signed-off-by: Trent Piepho <[email protected]>
Signed-off-by: Mark Brown <[email protected]>