openharmony-standard: display_device.c file into a relative subdir path

instead of using the absolute path using the ${S} variable, use an relative 
subdir path to copy the display_device.c file in the source directory.
This allows the correct build when using an external source directory, 
such as when using a devtool workspace.

Signed-off-by: Francesco Pham <francesco.pham@huawei.com>

recipes-openharmony/openharmony/openharmony-standard_3.0.bb

@@ -49,7 +49,7 @@ SRC_URI += "file://vendor-qemu-uhdf-files.patch;patchdir=${S}/drivers/peripheral
 SRC_URI += "git://gitlab.eclipse.org/eclipse/oniro-core/openharmony-vendor-oniro.git;protocol=https;branch=main;rev=c7f69115d7af1a37f81bd4fc0462100d0aa87c2d;destsuffix=${S}/vendor/oniro"
 
 SRC_URI += "file://peripherals-Limit-drivers-list-to-supported-by-the-qemuarm.patch;patchdir=${S}/drivers/adapter"
-SRC_URI += "file://display_device.c;subdir=${S}/drivers/peripheral/display/hal/default/standard_system"
+SRC_URI += "file://display_device.c;subdir=src/drivers/peripheral/display/hal/default/standard_system"
 SRC_URI += "file://display-Use-temporary-qemuarm-implementation.patch;patchdir=${S}/drivers/peripheral"
 SRC_URI += "file://display_gralloc_gbm.c-Use-card-drm-node.patch;patchdir=${S}/device/hihope"
 SRC_URI += "file://hihope-gralloc-Backport-to-3.0.patch;patchdir=${S}/device/hihope"