java: in methods taking buffers as arguments, changed buffer type from short[] to byte[]

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/lcd/javaupm_i2clcd.i

@@ -3,8 +3,8 @@
 %include "stdint.i"
 %include "typemaps.i"
 %include "arrays_java.i";
-        
-%apply unsigned char[] {uint8_t *};
+
+%apply signed char[] {uint8_t *};
 %apply uint8_t *OUTPUT { uint8_t *data };