mtd: spi-nor: add dt support for Everspin MRAMs

The MR25 family doesn't support JEDEC, so they need explicit mentioning
in the list of supported spi IDs. This makes it possible to add these
using for example:

	compatible = "everspin,mr25h40";

There was already an entry for mr25h256. Move that one out of the "keep
for compatibility" section and put in a new group for Everspin MRAMs.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>

Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt

@@ -14,6 +14,8 @@ Required properties:
                  at25df641
                  at26df081a
                  mr25h256
+                 mr25h10
+                 mr25h40
                  mx25l4005a
                  mx25l1606e
                  mx25l6405d

drivers/mtd/devices/m25p80.c

@@ -289,7 +289,6 @@ static const struct spi_device_id m25p_ids[] = {
 	 * should be kept for backward compatibility.
 	 */
 	{"at25df321a"},	{"at25df641"},	{"at26df081a"},
-	{"mr25h256"},
 	{"mx25l4005a"},	{"mx25l1606e"},	{"mx25l6405d"},	{"mx25l12805d"},
 	{"mx25l25635e"},{"mx66l51235l"},
 	{"n25q064"},	{"n25q128a11"},	{"n25q128a13"},	{"n25q512a"},
@@ -306,6 +305,11 @@ static const struct spi_device_id m25p_ids[] = {
 	{"m25p40-nonjedec"},	{"m25p80-nonjedec"},	{"m25p16-nonjedec"},
 	{"m25p32-nonjedec"},	{"m25p64-nonjedec"},	{"m25p128-nonjedec"},
 
+	/* Everspin MRAMs (non-JEDEC) */
+	{ "mr25h256" }, /* 256 Kib, 40 MHz */
+	{ "mr25h10" },  /*   1 Mib, 40 MHz */
+	{ "mr25h40" },  /*   4 Mib, 40 MHz */
+
 	{ },
 };
 MODULE_DEVICE_TABLE(spi, m25p_ids);