x86: legacy: enable pata_sis driver

This driver is needed to boot from CompactFlash on the Siemens Futro S400.
The device has an AMD NX1500 CPU, which seems to be unsupported by the
geode subtarget, so it must use legacy.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

target/linux/x86/legacy/config-5.10

@@ -173,6 +173,7 @@ CONFIG_PATA_MPIIX=y
 CONFIG_PATA_OLDPIIX=y
 CONFIG_PATA_PLATFORM=y
 CONFIG_PATA_SC1200=y
+CONFIG_PATA_SIS=y
 CONFIG_PATA_TIMINGS=y
 CONFIG_PATA_VIA=y
 CONFIG_PCIEAER=y