spi: stm32_qspi: Align reg-names with kernel 4.12 RC1

Align qspi bindings following kernel dt-bindings
Documentation/devicetree/bindings/mtd/stm32-quadspi.txt
from kernel v4.12-rc1.

Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

drivers/spi/stm32_qspi.c

@@ -420,13 +420,13 @@ static int stm32_qspi_ofdata_to_platdata(struct udevice *bus)
 	int ret;
 
 	ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
-				     "QuadSPI", &res_regs);
+				     "qspi", &res_regs);
 	if (ret) {
 		debug("Error: can't get regs base addresses(ret = %d)!\n", ret);
 		return -ENOMEM;
 	}
 	ret = fdt_get_named_resource(blob, node, "reg", "reg-names",
-				     "QuadSPI-memory", &res_mem);
+				     "qspi_mm", &res_mem);
 	if (ret) {
 		debug("Error: can't get mmap base address(ret = %d)!\n", ret);
 		return -ENOMEM;