ARM: lpc32xx: convert to use clkdev_add_table()

We have always had an efficient way of registering a table of clock
lookups - it's called clkdev_add_table().  However, some people seem
to really love writing inefficient and unnecessary code.

Convert LPC32xx to use the correct interface.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>