fix error in dcd_lpc175x_6x (still has problem with control transfer)

fix build error for host
start to add keil support for device
opt out pca9532.c when ea4357 is not the selected board

demos/bsp/boards/embedded_artists/oem_base_board/pca9532.c

@@ -24,6 +24,9 @@
 /******************************************************************************
  * Includes
  *****************************************************************************/
+#include "../../board.h"
+
+#if BOARD == BOARD_EA4357
 
 #include "lpc43xx_i2c.h"
 #include "lpc43xx_cgu.h"
@@ -342,3 +345,5 @@ void pca9532_setBlink1Leds(uint16_t ledMask)
     blink1Shadow |= ledMask;
     setLeds();
 }
+
+#endif