clk: armada-xp: remove unused code

clk: armada-xp: remove unused code

drivers/clk/mvebu/armada-xp.c:171:38: warning:
 mv98dx3236_coreclks defined but not used [-Wunused-const-variable=]
drivers/clk/mvebu/armada-xp.c:213:41: warning:
 mv98dx3236_gating_desc defined but not used [-Wunused-const-variable=]

They are not used since commit 337072604224 ("clk: mvebu:
Expand mv98dx3236-core-clock support").

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lkml.kernel.org/r/20191111140420.36092-1-yuehaibing@huawei.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>