mt8173: Move SPM related PLL settings to ARM TF

Move SPM related PLL settings to spm_boot_init in ARM TF SPM driver

Change-Id: I414b896caae072570c8de33a25e06db4ae011f57
diff --git a/plat/mediatek/mt8173/drivers/spm/spm.c b/plat/mediatek/mt8173/drivers/spm/spm.c
index 2801925..45defd8 100644
--- a/plat/mediatek/mt8173/drivers/spm/spm.c
+++ b/plat/mediatek/mt8173/drivers/spm/spm.c
@@ -386,6 +386,8 @@
 {
 	/* Only CPU0 is online during boot, initialize cpu online reserve bit */
 	mmio_write_32(SPM_PCM_RESERVE, 0xFE);
+	mmio_clrbits_32(AP_PLL_CON3, 0xFFFFF);
+	mmio_clrbits_32(AP_PLL_CON4, 0xF);
 	spm_lock_init();
 	spm_register_init();
 }