Remove gdb-6.6-bz230000-power6-disassembly-test.patch
    
    Remove gdb-6.6-bz230000-power6-disassembly-test.patch as this is now
    covered by upstream tests.  This patch added some tests of the Power6
    disassembler.  Disassembler tests are better carried in the gas tree.
    
    Upstream commit:
    
      commit 0fcf99b8ab5ccbde30fa7d36742e670cd4df48ef
      Date:   Mon Jan 30 11:47:31 2023 +0000
    
          gas/ppc: Additional tests for DFP instructions
    
    Added some new assembler/disassembler tests to the gas tree that
    covered all the instructions that were covered by our local patch.