When overclocking the CPU 133%, overclock flash by 40% too

teensy3/mk20dx128.c

 	// now we're in PBE mode
 
 #if F_CPU == 168000000
-	// config divisors: 168 MHz core, 56 MHz bus, 28 MHz flash
-	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) |	 SIM_CLKDIV1_OUTDIV4(5);
+	// config divisors: 168 MHz core, 56 MHz bus, 33.6 MHz flash
+	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) |	 SIM_CLKDIV1_OUTDIV4(4);
 #elif F_CPU == 144000000
 	// config divisors: 144 MHz core, 48 MHz bus, 28.8 MHz flash
 	SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) |	 SIM_CLKDIV1_OUTDIV4(4);

teensy3/mk20dx128.h

 
 #if (F_CPU == 168000000)
  #define F_BUS 56000000
- #define F_MEM 28000000
+ #define F_MEM 33600000
 #elif (F_CPU == 144000000)
  #define F_BUS 48000000
  #define F_MEM 28800000