cpu/via/nano: Drop support

Relocatable ramstage, postcar stage and C_ENVIRONMENT_BOOTBLOCK are
now mandatory features, which this platform lacks.

Change-Id: I6d9771e97619c3775f8325daf4b8453cd51d6571
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36950
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/cpu/Makefile.inc

@@ -6,7 +6,6 @@ subdirs-y += amd
 subdirs-y += armltd
 subdirs-y += intel
 subdirs-y += ti
-subdirs-y += via
 subdirs-$(CONFIG_ARCH_X86) += x86
 subdirs-$(CONFIG_CPU_QEMU_X86) += qemu-x86