Add support to build using Tizen-X repo

Add support to build using Tizen-X repo

Commit introduces ability to build the chromium-efl on riscv64, x86_64, i586 and armv7l
architecture, using Tizen-X repos

* Added scripts of format tizen_src/build/build_x_{arch}.sh to quickly run builds for
specific architerctures using Tizen-X repository

* Added Tizen-X repo and profile to gbs.conf.in in form of tz_X*

* Added if switch in common.sh. When the platform is defined as base-X we are assigning
profile as tz_X

Change-Id: I92e80ce5efe353d849a5e0ff747f782ed91f7d9b
Signed-off-by: Aleksander Świniarski <a.swiniarski@samsung.com>