*/Makefile.inc: Compile files needed by uart8250 in x86 bootblock

These files provide symbols needed by console and uart drivers. This
was not an issue in the past, as we were not setting up a C
environment this early in the boot process.

Change-Id: Ied5106ac30a68971c8330e8f8270ab060994a89d
Signed-off-by: Alexandru Gagniuc <alexandrux.gagniuc@intel.com>
Reviewed-on: https://review.coreboot.org/12869
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/drivers/uart/Makefile.inc b/src/drivers/uart/Makefile.inc
index fc33ee9..4b2aa53 100644
--- a/src/drivers/uart/Makefile.inc
+++ b/src/drivers/uart/Makefile.inc
@@ -10,6 +10,7 @@
 # be located in the soc/ or cpu/ directories instead of here.
 
 ifeq ($(CONFIG_DRIVERS_UART_8250IO),y)
+bootblock-y += uart8250io.c
 verstage-y += uart8250io.c
 romstage-y += uart8250io.c
 ramstage-y += uart8250io.c
@@ -17,6 +18,7 @@
 endif
 
 ifeq ($(CONFIG_DRIVERS_UART_8250MEM),y)
+bootblock-y += uart8250mem.c
 verstage-y += uart8250mem.c
 romstage-y += uart8250mem.c
 ramstage-y += uart8250mem.c