cpu/via/c7: Compress ramstage with LZ4 by default

It's a slow CPU.

Change-Id: I0bf75f410c1d9134f05a2d11b8d011499a7cf794
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82772
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/via/c7/Kconfig

@@ -8,6 +8,7 @@ config CPU_VIA_C7
 	select UNKNOWN_TSC_RATE
 	select UDELAY_LAPIC
 	select LAPIC_MONOTONIC_TIMER
+	select MB_COMPRESS_RAMSTAGE_LZ4
 
 if CPU_VIA_C7