Remove call to `addHyphenator("am", 1, 1)`

This fixes the error message that occurs every time Android boots:
    E zygote  : Unable to find pattern file or unable to map it for am

The `am` hyphenator file (hyph-am.hyb) does not exist.

$ ls -al /system/usr/hyphen-data/hyph-am.hyb
ls: /system/usr/hyphen-data/hyph-am.hyb: No such file or directory

`am` is aliased to `und-Ethi` below.

Test: todo
Flag: EXEMPT dead code cleanup
Bug: 436377626
Change-Id: I8ae35baff1d2c4996a48d8b614361b20c252a108