[llvm-cgdata] Remove GENERATE_DRIVER option (#100066)

Summary:
This tool shouldn't be used in the driver build until it is converted to
use `OptTable` for option parsing, otherwise the `cl::opt` options might
conflict with options in other tools resulting in link failures.

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

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Differential Revision: https://phabricator.intern.facebook.com/D60251222

llvm/tools/llvm-cgdata/CMakeLists.txt

@@ -11,5 +11,4 @@ add_llvm_tool(llvm-cgdata
 
   DEPENDS
   intrinsics_gen
-  GENERATE_DRIVER
   )