DynamicTablesPkg: Fix GTBlock and GTBlockTimerFrame CmObjParsers

DynamicTablesPkg: Fix GTBlock and GTBlockTimerFrame CmObjParsers

The CmObjParsers of the following objects was inverted, probably
due to a wrong ordering placement in the file defining the structures:
-EArmObjGTBlockTimerFrameInfo
-EArmObjPlatformGTBlockInfo

Assign the correct parser for each object, and re-order the
structures in the file defining them.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>