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i2cbcm: use core clock rate from vcore instead of hardcoding 250Mhz

--- a/sys/src/9/bcm/i2cbcm.c

+++ b/sys/src/9/bcm/i2cbcm.c

@@ -110,7 +110,7 @@

 i2cinit(I2Cbus*)

 {

 	ctlr.regs = (Bsc*)I2CREGS;

-	ctlr.regs->clkdiv = 2500;

+	ctlr.regs->clkdiv = getclkrate(ClkCore) / 100000;

 	gpiosel(SDA0Pin, Alt0);

 	gpiosel(SCL0Pin, Alt0);