Correct SPL uses of MULTIPLEXER

This converts 3 usages of this option to the non-SPL form, since there is
no SPL_MULTIPLEXER defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/Makefile b/drivers/Makefile
index 15d19d0..58be410 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -18,7 +18,6 @@
 obj-$(CONFIG_$(SPL_TPL_)LED) += led/
 obj-$(CONFIG_$(SPL_TPL_)MMC) += mmc/
 obj-y += mtd/
-obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux/
 obj-$(CONFIG_$(SPL_TPL_)ETH) += net/
 obj-$(CONFIG_$(SPL_TPL_)PCH) += pch/
 obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
@@ -87,6 +86,7 @@
 obj-$(CONFIG_FWU_MDATA) += fwu-mdata/
 obj-y += misc/
 obj-$(CONFIG_MMC) += mmc/
+obj-$(CONFIG_MULTIPLEXER) += mux/
 obj-$(CONFIG_NVME) += nvme/
 obj-$(CONFIG_PCI_ENDPOINT) += pci_endpoint/
 obj-y += dfu/
diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile
index 78ebf04..d4e2478 100644
--- a/drivers/mux/Makefile
+++ b/drivers/mux/Makefile
@@ -3,5 +3,5 @@
 # (C) Copyright 2019
 # Jean-Jacques Hiblot <jjhiblot@ti.com>
 
-obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux-uclass.o
+obj-$(CONFIG_MULTIPLEXER) += mux-uclass.o
 obj-$(CONFIG_$(SPL_)MUX_MMIO) += mmio.o
diff --git a/include/mux.h b/include/mux.h
index 9f80991..c92d887 100644
--- a/include/mux.h
+++ b/include/mux.h
@@ -23,7 +23,7 @@
 struct udevice;
 struct mux_control;
 
-#if CONFIG_IS_ENABLED(MULTIPLEXER)
+#if IS_ENABLED(CONFIG_MULTIPLEXER)
 /**
  * mux_control_states() - Query the number of multiplexer states.
  * @mux: The mux-control to query.