am33xx: Add required includes to some omap/am33xx code

- In arch/arm/cpu/armv7/omap-common/timer.c,
  drivers/mtd/nand/omap_gpmc.c and drivers/net/cpsw.c add #include files
  that the driver needs but had been relying on <config.h> to bring in.
- In arch/arm/cpu/armv7/omap-common/lowlevel_init.S add <config.h>
- In am335x_evm.h and pcm051.h don't globally include
  <asm/arch/hardware.h> and <asm/arch/cpu.h> but just <asm/arch/omap.h>
  as that is the only include which defines things the config uses.

Cc: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/pcm051.h b/include/configs/pcm051.h
index 63ab123..d0ea74e 100644
--- a/include/configs/pcm051.h
+++ b/include/configs/pcm051.h
@@ -21,8 +21,7 @@
 
 #define CONFIG_AM33XX
 
-#include <asm/arch/cpu.h>
-#include <asm/arch/hardware.h>
+#include <asm/arch/omap.h>
 
 #define CONFIG_DMA_COHERENT
 #define CONFIG_DMA_COHERENT_SIZE	(1 << 20)