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>