MAINTAINERS: update clk/sirf patterns

Commit 7bf21bc8

 ("clk: sirf: re-arch to make the codes support both
prima2 and atlas6") moved the files, update the patterns.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>