Enable Meson Build system for phoshphor-time-manager

- This commit enables the meson build system for the
phoshphor-time-manager repo.

Tested By:
- Code compiles both in a

Enable Meson Build system for phoshphor-time-manager

- This commit enables the meson build system for the
phoshphor-time-manager repo.

Tested By:
- Code compiles both in arm & x86 sdks without errors or warnings.
- All the unit test cases are getting passed.

Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
Change-Id: I311bf33f34c6c71860e9c845b6ca3c591af8fa6a

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