samples/drivers: Nucleo_F207zg: Enable test_spi_loopback sample application

This commit enables test_spi_loopback sample application for
Nucleo_F207zg. test_spi_loopback was executed under the following case
 sceanarios on SPI-1:
	a. With DMA
	b. No DMA - No Interrrupts
	c. No DMA - Interrupts Enabled

Signed-off-by: Krishna Mohan Dani <krishnamohan.d@hcl.com>
2 files changed