mx23: Add boot mode description

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/include/asm/arch-mxs/sys_proto.h

@@ -52,6 +52,17 @@ struct mxs_pair {
 };
 
 static const struct mxs_pair mxs_boot_modes[] = {
+#if defined(CONFIG_MX23)
+	{ 0x00, 0x0f, "USB" },
+	{ 0x01, 0x1f, "I2C, master" },
+	{ 0x02, 0x1f, "SSP SPI #1, master, NOR" },
+	{ 0x03, 0x1f, "SSP SPI #2, master, NOR" },
+	{ 0x04, 0x1f, "NAND" },
+	{ 0x08, 0x1f, "SSP SPI #3, master, EEPROM" },
+	{ 0x09, 0x1f, "SSP SD/MMC #0" },
+	{ 0x0a, 0x1f, "SSP SD/MMC #1" },
+	{ 0x00, 0x00, "Reserved/Unknown/Wrong" },
+#elif defined(CONFIG_MX28)
 	{ 0x00, 0x0f, "USB #0" },
 	{ 0x01, 0x1f, "I2C #0, master, 3V3" },
 	{ 0x11, 0x1f, "I2C #0, master, 1V8" },
@@ -68,6 +79,7 @@ static const struct mxs_pair mxs_boot_modes[] = {
 	{ 0x0a, 0x1f, "SSP SD/MMC #1, 3V3" },
 	{ 0x1a, 0x1f, "SSP SD/MMC #1, 1V8" },
 	{ 0x00, 0x00, "Reserved/Unknown/Wrong" },
+#endif
 };
 
 struct mxs_spl_data {