lib: Enable hexdump in verstage

Enable the hexdump function in verstage as it can be useful there for
debugging I2C and TPM transactions.

Change-Id: If9dc4bcc30964e18ff5d8a98559f6306c0adec6f
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/16528
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/lib/Makefile.inc

@@ -147,6 +147,7 @@ postcar-y += imd.c
 bootblock-y += hexdump.c
 ramstage-y += hexdump.c
 romstage-y += hexdump.c
+verstage-y += hexdump.c
 
 bootblock-$(CONFIG_REG_SCRIPT) += reg_script.c
 verstage-$(CONFIG_REG_SCRIPT) += reg_script.c