BaseTools: Fixed a code bug for Pcd Array.

BaseTools: Fixed a code bug for Pcd Array.

For example, PCD gUefiOvmfPkgTokenSpaceGuid.Test001 datatype is Array:
TEST1[2]
and the filed TEST1UINT64ARRAY in TEST1 is also an array:
UINT64 TEST1UINT64ARRAY[2];

Then the following filed assignment in DSC will cause build failure.
gUefiOvmfPkgTokenSpaceGuid.Test001[0].TEST1UINT64ARRAY|{'A','B'}

The root cause is build tool generate incorrect PcdValueInit.c File.

This patch is going to fix this issue.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>