Makefile: Avoid duplicate installation of utility
Makefile: Avoid duplicate installation of utility

The current rules for 'utils_install_sdk' and 'utils_install_board'
individually install the required list of binaries and scripts. When
there are overlapping files in 'UTIL_NAMES_SDK' and 'UTIL_NAMES_BOARD',
the second executed rule will fail with duplicate installation.

Instead of having a single phony target that installs all the files,
define a rule 'util_install-<FILE>' for each file to ensure that each
one will be installed at most once.

BUG=b:207452735
TEST=make runtests
TEST=emerge-dedede vboot_reference
TEST=FEATURES=test emerge-dedede vboot_reference
TEST=sudo emerge vboot_reference
BRANCH=none

Change-Id: I24c23a61c4ff7de851bf11541bc46c963bf35c22
Signed-off-by: Yu-Ping Wu <e17b963d2ce5bddd1fecae25c320252b132e804d@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3299836
Reviewed-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot