lpc32xx: Flash driver

Based on the lpc3180 driver, but released as a separate driver for two reasons:
 1) I don't have an lpc3180 to test it against, so it might unintentionally break compatibility.
 2) It's using a different OOB layout than lpc3180.

Rewritten so that it no longer borrows code from the NXP CDL library.  Instead borrowing code from the u-boot port to lpc32xx, written by Kevin Wells.

Tested on lpc3250 (Hitex LPC3250-Stick).  OOB layout is compatible with LPCLinux.

src/flash/nand/Makefile.am

@@ -16,6 +16,7 @@ NAND_DRIVERS = \
 	nonce.c \
 	davinci.c \
 	lpc3180.c \
+	lpc32xx.c \
 	mx2.c \
 	mx3.c \
 	orion.c \
@@ -35,6 +36,7 @@ noinst_HEADERS = \
 	fileio.h \
 	imp.h \
 	lpc3180.h \
+	lpc32xx.h \
 	mx2.h \
 	mx3.h \
 	s3c24xx.h \