ARM: mxs: Add OCOTP driver

Add yet another OCOTP driver for this i.MX family. This time, it's a driver for
the OCOTP variant found in the i.MX23 and i.MX28. This version of OCOTP is too
different from the i.MX6 one that I could not use the mxc_ocotp.c driver without
making it into a big pile of #ifdef . This driver implements the regular fuse
command interface, but due to the IP blocks' limitation, we support only READ
and PROG functions.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

include/configs/mxs.h

@@ -182,6 +182,11 @@
 #define CONFIG_SYS_NAND_5_ADDR_CYCLE
 #endif
 
+/* OCOTP */
+#ifdef CONFIG_CMD_FUSE
+#define CONFIG_MXS_OCOTP
+#endif
+
 /* SPI */
 #ifdef CONFIG_CMD_SPI
 #define CONFIG_HARD_SPI