drivers: spi: xmc4xxx: Fix potential runtime error
Fixes an unhandled interrupt runtime crash if CONFIG_SPI_XMC4XXX_DMA=y and
CONFIG_SPI_XMC4XXX_INTERRUPT=n.
The unhandled interrupt error is triggered because irq_enable() was called
without calling IRQ_CONNECT() when CONFIG_SPI_XMC4XXX_INTERRUPT=n.
Signed-off-by:
Andriy Gelman <andriy.gelman@gmail.com>
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