test: build test/boot for CONFIG_UT_BOOTSTD=n

Building sandbox_defconfig with

    CONFIG_UT_BOOTSTD=n
    CONFIG_MEASURMENT=y

results in an error:

    /usr/bin/ld: test/cmd_ut.o:(.data.rel.cmd_ut_sub+0x408):
    undefined reference to `do_ut_measurement'

Fixes: 5999ea20fa42 ("test: Add sandbox TPM boot measurement")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/test/Makefile b/test/Makefile
index 9aeef02..ed312cd 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -26,7 +26,7 @@
 obj-y += ut.o
 
 ifeq ($(CONFIG_SPL_BUILD),)
-obj-$(CONFIG_$(SPL_)UT_BOOTSTD) += boot/
+obj-y += boot/
 obj-$(CONFIG_UNIT_TEST) += common/
 obj-y += log/
 obj-$(CONFIG_$(SPL_)UT_UNICODE) += unicode_ut.o