dts: arm: nrf52840_pca10056: Increase mcuboot partition size
dts: arm: nrf52840_pca10056: Increase mcuboot partition size

Boot serial recovery feature consume additional
memory size so the mcuboot partition must been
expanded on cost of images partitions.

Signed-off-by: Andrzej Puzdrowski <0222c24e1773dd88269ed0e559909ec9bea3604a@nordicsemi.no>

punitvara/zephyr,kraj/zephyr,finikorg/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,punitvara/zephyr,mbolivar/zephyr,kraj/zephyr,ldts/zephyr,punitvara/zephyr,aceofall/zephyr-iotos,kraj/zephyr,zephyriot/zephyr,nashif/zephyr,ldts/zephyr,explora26/zephyr,ldts/zephyr,galak/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,aceofall/zephyr-iotos,ldts/zephyr,galak/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,zephyriot/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,mbolivar/zephyr,mbolivar/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,mbolivar/zephyr,kraj/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,explora26/zephyr,kraj/zephyr,aceofall/zephyr-iotos,ldts/zephyr,Vudentz/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr