ARM: OMAP2+: clock: add low-level support for regmap

Some of the TI clock providers will be converted to use syscon, thus
low-level regmap support is needed for the clock drivers also. This
patch adds this support, which can be enabled for individual drivers
in later patches.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --cc arch/arm/mach-omap2/clock.c
Simple merge

diff --cc arch/arm/mach-omap2/clock.h
Simple merge

diff --cc arch/arm/mach-omap2/cm_common.c
Simple merge

diff --cc arch/arm/mach-omap2/control.c
Simple merge

diff --cc arch/arm/mach-omap2/prm_common.c
Simple merge