QuarkPlatformPkg/Tpm12DeviceLibAtmelI2c: Fix GCC build issues

QuarkPlatformPkg/Tpm12DeviceLibAtmelI2c: Fix GCC build issues

https://bugzilla.tianocore.org/show_bug.cgi?id=335

Fix build issues with GCC49.  There are local variables that
may be used before initialized in some paths.

Cc: Kelly Steele <kelly.steele@intel.com>
Cc: Lee Leahy <leroy.p.leahy@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Lee Leahy <leroy.p.leahy@intel.com>