hw-breakpoints: Check disabled breakpoints again

We stopped checking disabled breakpoints because we weren't
allowing breakpoints on NULL addresses. And gdb tends to set
NULL addresses on inactive breakpoints.

But refusing NULL addresses was actually a regression that has
been fixed now. There is no reason anymore to not validate
inactive breakpoint settings.

Signed-off-by: Frederic Weisbecker <[email protected]>
Acked-by: Paul Mundt <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mahesh Salgaonkar <[email protected]>
Cc: K. Prasad <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Jason Wessel <[email protected]>
Cc: Ingo Molnar <[email protected]>

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