boards: adjusted TIMER_0 defines for NRF based b.

adjusted for
- pca10000
- pca10005
- yunjia-nrf51822
cpu/nrf51822: fixed timers

- changed TIMER_0 to be a 24-bit timer -> see Nordic PAN #32
- cleaned up timer initialization code
- added check if an interrupt channel was active
transceiver: fix ignore command for 802.15.4 radios
Merge pull request #2000 from OlegHahm/ieee802154_transceiver_ignore

transceiver: fix ignore command for 802.15.4 radios
Merge pull request #1827 from haukepetersen/fix_nrf_timer

cpu/nrf51822: fixed timers