sc7180: Enable bootblock compression

This patch enables bootblock compression on SC7180. In my tests, that
makes it boot roughly 10ms faster (which isn't much, but... might as
well take it).

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: Ibbe06eeb05347cc77395681969e6eaf1598b4260
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45855
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/arm64/Makefile.inc

@@ -31,6 +31,7 @@ bootblock-y += id.S
 $(call src-to-obj,decompressor,$(dir)/id.S): $(obj)/build.h
 $(call src-to-obj,bootblock,$(dir)/id.S): $(obj)/build.h
 
+decompressor-$(CONFIG_ARM64_USE_ARCH_TIMER) += arch_timer.c
 bootblock-$(CONFIG_ARM64_USE_ARCH_TIMER) += arch_timer.c
 bootblock-y += transition.c transition_asm.S