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/configs/chromebook_link64_defconfig b/configs/chromebook_link64_defconfig
index b48505a..10d4fd1 100644
--- a/configs/chromebook_link64_defconfig
+++ b/configs/chromebook_link64_defconfig
@@ -37,7 +37,7 @@
 CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_PCI=y
-CONFIG_SPL_PCH_SUPPORT=y
+CONFIG_SPL_PCH=y
 CONFIG_SPL_RTC_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_CPU=y