clk: pwm: drop of_match_ptr from of_device_id table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it might be not relevant here).  This
fixes compile warning (!CONFIG_OF && !CONFIG_MODULES):

    drivers/clk/clk-pwm.c:139:34: warning:
        ‘clk_pwm_dt_ids’ defined but not used [-Wunused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201103162435.13689-1-krzk@kernel.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-pwm.c

@@ -147,7 +147,7 @@ static struct platform_driver clk_pwm_driver = {
 	.remove = clk_pwm_remove,
 	.driver = {
 		.name = "pwm-clock",
-		.of_match_table = of_match_ptr(clk_pwm_dt_ids),
+		.of_match_table = clk_pwm_dt_ids,
 	},
 };