Add style-checker to telephony CTS tests.

Currently, the style-checker doesn't run for changes in telephony CTS
tests. This should be changed to ensure that stylistic errors are
avoided in these directories.

Bug: 129869133
Bug: 129876292
Test: Only style-checker config change. No tests affected.
Change-Id: I2c3018ba6e961acf7f71584e55b346264a0690e1
1 file changed