c6x: Fix misspellings in comments.

Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

arch/c6x/include/asm/clock.h

@@ -101,7 +101,7 @@ struct clk {
 #define CLK_PLL			BIT(2) /* PLL-derived clock */
 #define PRE_PLL			BIT(3) /* source is before PLL mult/div */
 #define FIXED_DIV_PLL		BIT(4) /* fixed divisor from PLL */
-#define FIXED_RATE_PLL		BIT(5) /* fixed ouput rate PLL */
+#define FIXED_RATE_PLL		BIT(5) /* fixed output rate PLL */
 
 #define MAX_PLL_SYSCLKS 16