rtc: imxdi: fix trivial typos

Fix typos 'pionter' -> 'pointer' and 'softwere' -> 'software'

Signed-off-by: Tales L. da Aparecida <tales.aparecida@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200624012119.54768-1-tales.aparecida@gmail.com