post: new nor flash test

This adds a simple flash test to automatically verify erasing,
writing, and reading of sectors.  The code is based on existing
Blackfin tests but generalized for everyone to use.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/post/drivers/Makefile b/post/drivers/Makefile
index 0d87ae0..85d6c03 100644
--- a/post/drivers/Makefile
+++ b/post/drivers/Makefile
@@ -24,6 +24,6 @@
 
 LIB	= libpostdrivers.o
 
-COBJS-$(CONFIG_HAS_POST)	+= i2c.o memory.o rtc.o
+COBJS-$(CONFIG_HAS_POST)	+= flash.o i2c.o memory.o rtc.o
 
 include $(TOPDIR)/post/rules.mk