ARM: at91/pm_suspend: add the WFI instruction support for ARMv7
ARM: at91/pm_suspend: add the WFI instruction support for ARMv7

Add the WFI instruction to make the cpu to the idle state.
In the meanwhile, disable the processor's clock.

Signed-off-by: Wenyou Yang <c376221f99e2c9ceacfa41dec806b26074cb7f05@atmel.com>
Acked-by: Alexandre Belloni <a7228e626ecf0022ac91fc1cd8db88e71d0e5e0e@free-electrons.com>
Tested-by: Sylvain Rochet <94c8fcb6911ae9a7ae147779ed948a4edf8546ae@finsecur.com>
Signed-off-by: Nicolas Ferre <45b517be0e5ec6dc3a39715767c1d18e090d39b4@atmel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs