Fix spelling of 'platform' in comments and doc

Replace platfrom -> platform.

This is a frequent spelling bug.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/blackfin/include/asm/nand.h b/arch/blackfin/include/asm/nand.h
index 3ae8b56..3a1e79d 100644
--- a/arch/blackfin/include/asm/nand.h
+++ b/arch/blackfin/include/asm/nand.h
@@ -1,5 +1,5 @@
 /*
- * BF5XX - NAND flash controller platfrom_device info
+ * BF5XX - NAND flash controller platform_device info
  *
  * Copyright 2007-2008 Analog Devices, Inc.
  *
@@ -8,7 +8,7 @@
 
 /* struct bf5xx_nand_platform
  *
- * define a interface between platfrom board specific code and
+ * define a interface between platform board specific code and
  * bf54x NFC driver.
  *
  * nr_partitions = number of partitions pointed to be partitoons (or zero)