Some PRM clocks are missing clockdomain assignments; add them.

Also, in OMAP2xxx clock tree, standardize the name for wdt1_osc_ck.

References for the OMAP2xxx clocks:

OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 TRM Version Q
  Table 18-41:
      - wdt1_osc_ck

References for the OMAP3xxx clocks:

OMAP34xx Multimedia Device Silicon Revision 3.0 Version I TRM
  Figure 4-13:
      - sys_clkout1,
  Table 4-37:
      - sys_ck
  Table 4-38:
      - omap_32k_fck, osc_sys_ck,
  Figure 4-56:
      - sr1_fck, sr2_fck
  Figure 4-57:
      - omap_96m_alwon_fck
  Section 4.7.7.13:
      - sr1_fck, sr2_fck

OMAP34xx Multimedia High Security (HS) Device Silicon Revision 3.0 Security
Addendum Version B TRM
  Table 2-5:
      - usim_fck
  Figure 3-29:
      - secure_32k_fck, gpt12_fck, wdt1_fck
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>