Add GEA3 & GEA4 ciphers

Corresponding test code include both official test vectors from the
specs and data from over-the-air tests.

This obsoletes libosmo-crypt-a53 as it was last missing piece
unimplemented in libosmogsm.

Change-Id: I939e4f6b91b4a7c591ef3761fe2d46ed1c2fb2d3
Related: OS#1582
diff --git a/.gitignore b/.gitignore
index 9cdf853..5165364 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,6 +62,7 @@
 tests/utils/utils_test
 tests/stats/stats_test
 tests/kasumi/kasumi_test
+tests/gea/gea_test
 tests/sms/sms_test
 tests/timer/timer_test
 tests/msgfile/msgfile_test