PPC: Create and use CONFIG_HIGH_BATS

Change all code that conditionally operates on high bat
registers (that is, BATs 4-7) to look at CONFIG_HIGH_BATS
instead of the myriad ways this is done now.  Define the option
for every config for which high bats are supported (and
enabled by early boot, on parts where they're not always
enabled)

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
diff --git a/include/configs/munices.h b/include/configs/munices.h
index 38b27bb..e0046ec 100644
--- a/include/configs/munices.h
+++ b/include/configs/munices.h
@@ -35,6 +35,7 @@
 #define BOOTFLAG_COLD		0x01	/* Normal Power-On: Boot from FLASH  */
 #define BOOTFLAG_WARM		0x02	/* Software reboot	     */
 #define CFG_CACHELINE_SIZE	32	/* For MPC5xxx CPUs */
+#define CONFIG_HIGH_BATS	1	/* High BATs supported */
 
 /*
  * Command line configuration.