BaseTools: Enable Pcd Array support.

BaseTools: Enable Pcd Array support.

https://bugzilla.tianocore.org/show_bug.cgi?id=1292

This patch is going to enable Array data type for PCD.

1. Support Pcd ARRAY as Structure PCD type
   including basic datatype array and structure array.
   For example:
   gStructuredPcdPkgTokenSpaceGuid.PcdTest|{0x0}|TEST[10]|0x00010080
   gStructuredPcdPkgTokenSpaceGuid.PcdTest2|{0x0}|UINT8[10]|0x00010081
2. Support C CODE style value initialization in DEC/DSC.
   For example:
gStructuredPcdPkgTokenSpaceGuid.PcdTest|{CODE({
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
  {0, {0, 0, 0, 0,  0, 0, 0}},
})}

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>