clk: imx: set imx_clk_gpr_mux_ops storage-class-specifier to static

smatch reports
drivers/clk/imx/clk-gpr-mux.c:73:22: warning: symbol 'imx_clk_gpr_mux_ops' was not declared. Should it be static?

imx_clk_gpr_mux_ops is only used in clk-gpr-mux.c, so it should be static.

Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230205030138.1723614-1-trix@redhat.com


Fixes: ee394f63 ("clk: imx: add clk-gpr-mux driver")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>