Remove font symlinks hack

Remove Android.mk symlink hack.
Use Android.bp prebuilt_font's symlinks property to install symlinks.

Bug: 157537895
Test: m DroidSansMono.ttf
Test: m Roboto-Regular.ttf Roboto-Bold.ttf
Test: # system/fonts/DroidSans.ttf -> Roboto-Regular.ttf
Test: # system/fonts/DroidSans-Bold.ttf -> Roboto-Bold.ttf
Change-Id: I5b311a3e32bd688e2a6be20d9b81d24560b7e133
2 files changed