ARM: at91/dt/trivial: fix file names in comments and model names

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
ARM: at91: pm: trival: get rid of compile warning

If not enable CONFIG_AT91_SLOW_CLOCK, when compile,
it will show following warning:
--->8---
arch/arm/mach-at91/pm.c:137:12: warning: ‘at91_pm_verify_clocks’ defined but not used
---8<---
This patch will get rid of it.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>