ARM: l2c: provide generic function for calling set_debug method
ARM: l2c: provide generic function for calling set_debug method

Provide a generic function which always calls the set_debug method.
This will be used later in the series as some work-arounds require
that the debug register be written.

Signed-off-by: Russell King <f6aa0246ff943bfa8602cdf60d40c481b38ed232@arm.linux.org.uk>

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