Commit 378523d1 ("clk: add lpc18xx creg clk driver")
added a new clock driver but missed the proper MFD_SYSCON select.
Fix it.

Fixes: 378523d1 ("clk: add lpc18xx creg clk driver")
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>