fix(PR): Added missing defines for ch32v003 SPI library (!827)

Author: UserR00T

examples/spi_slave/spi_slave.c

@@ -1,6 +1,11 @@
 #include "ch32fun.h"
 #include <stdio.h>
 
+#define CH32V003_SPI_SPEED_HZ 1000000
+#define CH32V003_SPI_DIRECTION_2LINE_TXRX
+#define CH32V003_SPI_CLK_MODE_POL0_PHA0
+#define CH32V003_SPI_NSS_SOFTWARE_ANY_MANUAL
+
 #include "../../extralibs/ch32v003_SPI.h"
 
 #define PIN_CS PC1