counter: microchip-tcb-capture: Fix the use of internal GCLK logic

As per the datasheet, the clock selection Bits 2:0 – TCCLKS[2:0] should
be set to 0 while using the internal GCLK (TIMER_CLOCK1).

Fixes: 106b1041 ("counter: Add microchip TCB capture counter")
Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
Link: https://lore.kernel.org/r/20230905100835.315024-1-dharma.b@microchip.com


Signed-off-by: William Breathitt Gray <william.gray@linaro.org>