misc: change RCC form MISC to NOP uclass

The RCC driver have no operation so the new NOP uclass
is more appropriate. It only used as parent for clock and reset driver.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/misc/stm32_rcc.c b/drivers/misc/stm32_rcc.c
index 13d7069..e7efcde 100644
--- a/drivers/misc/stm32_rcc.c
+++ b/drivers/misc/stm32_rcc.c
@@ -68,8 +68,6 @@
 					    dev_ofnode(dev), &child);
 }
 
-static const struct misc_ops stm32_rcc_ops = {
-};
 
 static const struct udevice_id stm32_rcc_ids[] = {
 	{.compatible = "st,stm32f42xx-rcc", .data = (ulong)&stm32_rcc_clk_f42x },
@@ -82,8 +80,7 @@
 
 U_BOOT_DRIVER(stm32_rcc) = {
 	.name		= "stm32-rcc",
-	.id		= UCLASS_MISC,
+	.id		= UCLASS_NOP,
 	.of_match	= stm32_rcc_ids,
 	.bind		= stm32_rcc_bind,
-	.ops		= &stm32_rcc_ops,
 };