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/mem.c b/arch/arm/cpu/armv7/omap3/mem.c
index 1ca37a9..d04a5a1 100644
--- a/arch/arm/cpu/armv7/omap3/mem.c
+++ b/arch/arm/cpu/armv7/omap3/mem.c
@@ -42,7 +42,7 @@
 	M_NAND_GPMC_CONFIG5,
 	M_NAND_GPMC_CONFIG6, 0
 };
-#endif
+#endif /* CONFIG_CMD_NAND */
 
 #if defined(CONFIG_CMD_ONENAND)
 static const u32 gpmc_onenand[GPMC_MAX_REG] = {
@@ -53,7 +53,7 @@
 	ONENAND_GPMC_CONFIG5,
 	ONENAND_GPMC_CONFIG6, 0
 };
-#endif
+#endif /* CONFIG_CMD_ONENAND */
 
 /********************************************************
  *  mem_ok() - test used to see if timings are correct