Fix common misspellings in drivers

Fix common misspellings by using the list available at
http://en.wikipedia.org/wiki/Wikipedia:Lists_of_common_misspellings/For_machines

From the list cited above, the substitution script found the following
misspellings:

subsidary(-ies)->subsidiary(-ies)
transfering->transferring

drivers/atmodem/voicecall.c

@@ -508,7 +508,7 @@ static void at_transfer(struct ofono_voicecall *vc,
 	unsigned int transfer = 0x1 | 0x2;
 
 	/* Transfer can puts held & active calls together and disconnects
-	 * from both.  However, some networks support transfering of
+	 * from both.  However, some networks support transferring of
 	 * dialing/ringing calls as well.
 	 */
 	transfer |= 0x4 | 0x8;

drivers/hfpmodem/voicecall.c

@@ -562,7 +562,7 @@ static void hfp_transfer(struct ofono_voicecall *vc,
 {
 	struct voicecall_data *vd = ofono_voicecall_get_data(vc);
 	/* Transfer can puts held & active calls together and disconnects
-	 * from both.  However, some networks support transfering of
+	 * from both.  However, some networks support transferring of
 	 * dialing/ringing calls as well.
 	 */
 	unsigned int transfer = 0x1 | 0x2 | 0x4 | 0x8;

drivers/isimodem/gpds.h

@@ -1,7 +1,7 @@
 /*
  * This file is part of oFono - Open Source Telephony
  *
- * Copyright (C) 2010  Nokia Corporation and/or its subsidary(-ies).
+ * Copyright (C) 2010  Nokia Corporation and/or its subsidiary(-ies).
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as

drivers/isimodem/gprs-context.c

@@ -1,7 +1,7 @@
 /*
  * This file is part of oFono - Open Source Telephony
  *
- * Copyright (C) 2010  Nokia Corporation and/or its subsidary(-ies).
+ * Copyright (C) 2010  Nokia Corporation and/or its subsidiary(-ies).
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as

drivers/isimodem/gprs.c

@@ -1,7 +1,7 @@
 /*
  * This file is part of oFono - Open Source Telephony
  *
- * Copyright (C) 2010  Nokia Corporation and/or its subsidary(-ies).
+ * Copyright (C) 2010  Nokia Corporation and/or its subsidiary(-ies).
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as

drivers/stemodem/voicecall.c

@@ -340,7 +340,7 @@ static void ste_transfer(struct ofono_voicecall *vc,
 	unsigned int transfer = 0x1 | 0x2;
 
 	/* Transfer can puts held & active calls together and disconnects
-	 * from both.  However, some networks support transfering of
+	 * from both.  However, some networks support transferring of
 	 * dialing/ringing calls as well.
 	 */
 	transfer |= 0x4 | 0x8;