pch: Rename PCH_SUPPORT to PCH

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/Makefile b/drivers/Makefile
index 52fed3d..3a82ad6 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -15,7 +15,7 @@
 obj-$(CONFIG_$(SPL_TPL_)MMC) += mmc/
 obj-y += mtd/
 obj-$(CONFIG_$(SPL_)MULTIPLEXER) += mux/
-obj-$(CONFIG_$(SPL_TPL_)PCH_SUPPORT) += pch/
+obj-$(CONFIG_$(SPL_TPL_)PCH) += pch/
 obj-$(CONFIG_$(SPL_TPL_)PCI) += pci/
 obj-$(CONFIG_$(SPL_TPL_)PHY) += phy/
 obj-$(CONFIG_$(SPL_TPL_)PINCTRL) += pinctrl/