clk: at91: add PMC utmi clock

This adds new at91 utmi clock implementation using common clk framework.

This clock is a pll with a fixed factor (x40).
It is used as a source for usb clock.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

diff --cc arch/arm/mach-at91/Kconfig
Simple merge

diff --cc drivers/clk/at91/Makefile
Simple merge

diff --cc drivers/clk/at91/clk-utmi.c
Simple merge

diff --cc drivers/clk/at91/pmc.c
Simple merge

diff --cc drivers/clk/at91/pmc.h
Simple merge