These drivers are not needed on all platforms. While they are small, it is useful in TPL to drop then. Add Kconfig control to allow this.
Signed-off-by: Simon Glass Reviewed-by: Bin Meng
# SPDX-License-Identifier: GPL-2.0+ obj-y += pch-uclass.o obj-$(CONFIG_X86_PCH7) += pch7.o obj-$(CONFIG_X86_PCH9) += pch9.o obj-$(CONFIG_SANDBOX) += sandbox_pch.o
