Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/mips/include/asm/mach-loongson/cs5536/cs5536.h b/arch/mips/include/asm/mach-loongson/cs5536/cs5536.h
index 021f77c..2a8e2bb 100644
--- a/arch/mips/include/asm/mach-loongson/cs5536/cs5536.h
+++ b/arch/mips/include/asm/mach-loongson/cs5536/cs5536.h
@@ -1,5 +1,5 @@
 /*
- * The header file of cs5536 sourth bridge.
+ * The header file of cs5536 south bridge.
  *
  * Copyright (C) 2007 Lemote, Inc.
  * Author : jlliu <liujl@lemote.com>