staging: clocking-wizard: Fix incorrect type of speed grade

The speed grade type is unsigned according to the dt-bindings.

Fix sparse issue (-Wtypesign):
CHECK drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:162:56: warning: incorrect type in argument 3 (different signedness)
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:162:56: expected unsigned int [usertype] *out_value
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:162:56: got int *<noident>

Signed-off-by: Xavier Roumegue <[e-mail]>
Acked-by: Sören Brinkmann <[e-mail]>
Acked-by: Moritz Fischer <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c

···
 	struct clk *axi_clk;
 	struct clk *clks_internal[wzrd_clk_int_max];
 	struct clk *clkout[WZRD_NUM_OUTPUTS];
-	int speed_grade;
+	unsigned int speed_grade;
 	bool suspended;
 };