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imx8: increase cpu frequency from 1.4 to 1.6ghz

the RM seems to be outdated in this regard, saying
the core is targeted at 1.4ghz.

--- a/sys/src/9/imx8/ccm.c

+++ b/sys/src/9/imx8/ccm.c

@@ -146,7 +146,7 @@

 };

 static int input_clk_freq[] = {

-	[ARM_PLL_CLK] 1400*Mhz, 

+	[ARM_PLL_CLK] 1600*Mhz, 

 	[GPU_PLL_CLK] 1600*Mhz,

 	[VPU_PLL_CLK] 800*Mhz,

 	[DRAM_PLL1_CLK] 800*Mhz,

@@ -1015,7 +1015,8 @@

 	&& ((reg[1] ^ cfg1) & ~(1<<31)) == 0)

 		return;

-	reg[0] |= 1<<14;	/* bypass */

+	/* bypass */

+	reg[0] |= 1<<14;

 	reg[1] = cfg1;

--- a/sys/src/9/imx8/clock.c

+++ b/sys/src/9/imx8/clock.c

@@ -46,7 +46,7 @@

 		/* TURBO! */

 		setclkrate("ccm_arm_a53_clk_root", "osc_25m_ref_clk", 25*Mhz);

-		setclkrate("ccm_arm_a53_clk_root", "arm_pll_clk", 1400*Mhz);

+		setclkrate("ccm_arm_a53_clk_root", "arm_pll_clk", 1600*Mhz);

 	}

 	tstart = sysrd(CNTPCT_EL0);

 	do{