clk: sophgo: Make synthesizer struct static

Let all synthesizer structs are static to make the compiler happy.

Fixes: 80fd61ec ("clk: sophgo: Add clock support for CV1800 SoC")
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Link: https://lore.kernel.org/r/IA1PR20MB49531E437735A71A163694AEBB052@IA1PR20MB4953.namprd20.prod.outlook.com


Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404120548.y9dZIi0e-lkp@intel.com/


Signed-off-by: Stephen Boyd <sboyd@kernel.org>