omap3: Add a few comments to "#endif"s for readability.

No functional changes, just more comments for readability when a
preprocessor check spans more than a few lines, and for consistency.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
diff --git a/arch/arm/cpu/armv7/omap3/board.c b/arch/arm/cpu/armv7/omap3/board.c
index f3cd81a..89c587e 100644
--- a/arch/arm/cpu/armv7/omap3/board.c
+++ b/arch/arm/cpu/armv7/omap3/board.c
@@ -478,7 +478,7 @@
 	 */
 	omap3_update_aux_cr(0, 0x2);
 }
-#endif
+#endif /* !CONFIG_SYS_L2CACHE_OFF */
 
 #ifndef CONFIG_SYS_DCACHE_OFF
 void enable_caches(void)
@@ -486,4 +486,4 @@
 	/* Enable D-cache. I-cache is already enabled in start.S */
 	dcache_enable();
 }
-#endif
+#endif /* !CONFIG_SYS_DCACHE_OFF */