Enter ISP mode on lpc11u35 if button held on boot
Enter ISP mode on lpc11u35 if button held on boot

If the reset button is held on boot then enter ISP mode manually.
This allows devices without the ISP pin wired up to enter ISP mode.

Also add a delay before reading the reset button to make sure board
voltages have stabilized before reading the reset button.  This
prevents the Switch Science LPC824 from occasionally entering ISP
mode when initially connected.

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