src/corelibs/spi: Compilation error fix. (#76)

* src/corelibs/spi: Compilation error fix.

Signed-off-by: MDin <Dinesh.M-EE@infineon.com>

* src/corelibs/spi: Fix compilation issue.

Signed-off-by: MDin <Dinesh.M-EE@infineon.com>

---------

Signed-off-by: MDin <Dinesh.M-EE@infineon.com>

Author: dineshgit411

src/corelibs/spi/test_spi_connected2_masterpingpong.cpp

@@ -18,9 +18,9 @@
 
 // project includes
 #include <SPI.h>
-#ifndef SPI_TRANSFER_DELAY
-#define SPI_TRANSFER_DELAY 500
-#else
+#ifndef SPI_TRANSFER_DELAY_US
+#define SPI_TRANSFER_DELAY_US 500
+#endif
 const uint8_t MAX_BUFFER_SIZE = 20;
 const uint8_t MAX_TEST_ITERATION = 10;