board/BuR/common: fix PMIC mpu-pll setup

If a board-code calls the  pmicsetup(u32 mpupll) with a mpupll value
!= 0 it wants to force some frequency with the value provided by mpupll.
Setting up 1 GHz is wrong here.

Nobody did take notice about that yet, since every board calls this
function with zero.

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>

board/BuR/common/common.c

@@ -280,7 +280,7 @@ void pmicsetup(u32 mpupll)
 	printf("detected max. frequency: %d - ", dpll_mpu_opp100.m);
 
 	if (0 != mpupll) {
-		dpll_mpu_opp100.m = MPUPLL_M_1000;
+		dpll_mpu_opp100.m = mpupll;
 		printf("retuning MPU-PLL to: %d MHz.\n", dpll_mpu_opp100.m);
 	} else {
 		puts("ok.\n");