fixed spi_master_write to support transfer of 8+ bits

remove an unnecessary cast

Author: ShuopengDeng

targets/TARGET_Cypress/TARGET_PSOC6/cy_spi_api.c

@@ -130,13 +130,12 @@ void spi_frequency(spi_t *obj, int hz)
 int spi_master_write(spi_t *obj, int value)
 {
     struct spi_s *spi = cy_get_spi(obj);
-    uint8_t received;
-    uint8_t value_byte = (uint8_t)value;
+    int received;
 
-    if (CY_RSLT_SUCCESS != cyhal_spi_transfer(&(spi->hal_spi), &value_byte, 1, &received, 1, 0xff)) {
+    if (CY_RSLT_SUCCESS != cyhal_spi_transfer(&(spi->hal_spi), (const uint8_t *)&value, 1, (uint8_t *)&received, 1, 0xff)) {
         MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER_SPI, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_spi_transfer");
     }
-    return (int)received;
+    return received;
 }
 
 int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, char write_fill)