BaseTools: Convert string value of void* pcd in command line to array.
BaseTools: Convert string value of void* pcd in command line to array.

For void* type pcd in command line, if its value is string, then
convert the string value to array format. For example,
build --pcd gUefiOvmfPkgTokenSpaceGuid.PcdTest="c",
convert the pcd value from "c" to "{0x63,0x00}".

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: ZhiqiangX Zhao <d5cb37baecf82d4076c20e2d5029706f03fe31a0@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Cc: Bob Feng <f53a8c5610dbb66123cb988c78ae464e9da7199c@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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