regex-instance: HalInterface stores regex instances.

Parse <regex-instance> regular expression patterns using
Extended Regular Expression syntax, and store it in
HalInterface object.

Bug: 73738616
Test: libvintf_test
Test: vintf_object_test
Test: vts_treble_vintf_test

Change-Id: If0b8e3bc053a6c2ecd9048092071f52f7896bba0
6 files changed