Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h
index 027f40b..d23d979 100644
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -121,7 +121,7 @@
 };
 
 /**
- * struct pwrdm_ops - Arch specfic function implementations
+ * struct pwrdm_ops - Arch specific function implementations
  * @pwrdm_set_next_pwrst: Set the target power state for a pd
  * @pwrdm_read_next_pwrst: Read the target power state set for a pd
  * @pwrdm_read_pwrst: Read the current power state of a pd