soc/intel/apollolake: Select USE_LEGACY_8254_TIMER

CB:77409 corrected what the UPD `Timer8254ClkSetting` was set to; this
stopped a few boards from booting.

Selecting USE_LEGACY_8254_TIMER ensures that the previous behaviour is
maintained.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Ibf898cae6c9fbaf3dc7184eee745278d9b5eade4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78504
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/apollolake/Kconfig

@@ -100,6 +100,9 @@ config SOC_INTEL_GEMINILAKE
 
 if SOC_INTEL_APOLLOLAKE
 
+config USE_LEGACY_8254_TIMER
+	default y
+
 config SKIP_CSE_RBP
 	bool
 	default y if BOOT_DEVICE_MEMORY_MAPPED