Replace xargs with other shell command

Recently Android build team changed environment to use prebuilt toybox
binaries for common tools (aosp/852849). However, as toybox xargs does
not support -I option, update_and_install_ld_config.mk started to fail
filtering out private vndk libraries from the list. To resolve this,
xargs usages are replaced with other shell command (read).

Bug: 137832162
Test: m -j && tested on Cuttlefish
Change-Id: I218ce6272c781f826b87c8efc0d3c77bf6bc3af5