beaglebone-getting-started: Use cp options to not alter file mode

Fixes do_package_qa warnings
<FILE> is owned by uid 1000, which is the same as the user running bitbake. This may be due to host contamination

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

recipes-ti/beagleboard/beaglebone-getting-started.bb

@@ -14,7 +14,7 @@ S = "${WORKDIR}/git"
 
 do_install() {
 	install -d ${D}${datadir}/${PN}
-	cp -a ${S}/* ${D}${datadir}/${PN}
+	cp -R --no-dereference --preserve=mode,links ${S}/* ${D}${datadir}/${PN}
 }
 
 FILES_${PN} += "${datadir}/${PN}"