dts/arm: npcx: fix the invert field of JTAG0/1 selection

NPCX chip allows firmware to select the JTAG0/1 via bit 2/1 in the
DEVALT5 register. However, the selection logic is reverse
(i.e. 0:select; 1:not select.)
This change fixes the wrong setting of the invert field.

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Change-Id: I2c080feaa7647e940463d9491b61a342c84a6141