Fix the following gcc warning:

drivers/clk/ti/clk-7xx.c:320:43: warning: ‘dra7_gpu_sys_clk_data’
defined but not used [-Wunused-const-variable=]
 static const struct omap_clkctrl_div_data dra7_gpu_sys_clk_data
__initconst = {
                                           ^~~~~~~~~~~~~~~~~~~~~
drivers/clk/ti/clk-7xx.c:315:27: warning: ‘dra7_gpu_sys_clk_parents’
defined but not used [-Wunused-const-variable=]
 static const char * const dra7_gpu_sys_clk_parents[] __initconst = {
                           ^~~~~~~~~~~~~~~~~~~~~~~~
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lkml.kernel.org/r/20200417073523.42520-1-yanaijie@huawei.comAcked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>