db845c: qcom: Fix pointer arithmetic warnings.

Building the qcom tools, we see a lot of the following:
  warning: arithmetic on a pointer to void is a GNU extension

Fix this by casting the void* ptrs to char* when doing pointer
arithmatic.

Change-Id: Id2b0098388406bfc434ee01344a39e3413cb281c
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/qcom/rmtfs/storage.c b/qcom/rmtfs/storage.c
index 4c78ab3..c8e69ed 100644
--- a/qcom/rmtfs/storage.c
+++ b/qcom/rmtfs/storage.c
@@ -203,13 +203,13 @@
 	} else {
 		n = MIN(nbyte, rmtfd->shadow_len - offset);
 		if (n > 0)
-			memcpy(buf, rmtfd->shadow_buf + offset, n);
+			memcpy(buf, (char*)rmtfd->shadow_buf + offset, n);
 		else
 			n = 0;
 	}
 
 	if (n < nbyte)
-		memset(buf + n, 0, nbyte - n);
+		memset((char*)buf + n, 0, nbyte - n);
 
 	return nbyte;
 }
@@ -239,7 +239,7 @@
 		rmtfd->shadow_len = new_len;
 	}
 
-	memcpy(rmtfd->shadow_buf + offset, buf, nbyte);
+	memcpy((char*)rmtfd->shadow_buf + offset, buf, nbyte);
 
 	return nbyte;
 }