spi: stm32_qspi: Remove "st, stm32-qspi" compatible string

"st,stm32-qspi" is no more used, remove it.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/spi/stm32_qspi.c b/drivers/spi/stm32_qspi.c
index 8d612f2..958c394 100644
--- a/drivers/spi/stm32_qspi.c
+++ b/drivers/spi/stm32_qspi.c
@@ -526,7 +526,6 @@
 };
 
 static const struct udevice_id stm32_qspi_ids[] = {
-	{ .compatible = "st,stm32-qspi" },
 	{ .compatible = "st,stm32f469-qspi" },
 	{ }
 };