ARM: OMAP4: clock data: add clockdomains for clocks used as main clocks

Until the OMAP4 code is converted to disable the use of the clock
    framework-based clockdomain enable/disable sequence, any clock used as
    a hwmod main_clk must have a clockdomain associated with it.  This
    patch populates some clock structure clockdomain names to resolve the
    following warnings during kernel init:

    omap_hwmod: dpll_mpu_m2_ck: missing clockdomain for dpll_mpu_m2_ck.
    omap_hwmod: trace_clk_div_ck: missing clockdomain for trace_clk_div_ck.
    omap_hwmod: l3_div_ck: missing clockdomain for l3_div_ck.
    omap_hwmod: ddrphy_ck: missing clockdomain for ddrphy_ck.

Change-Id: Ida4a0ba272c16ea612567344752838f585854afc