brcmsmac: remove some pmu functions and use the bcma equivalents

This removes the following functions:
si_pmu_chipcontrol() => bcma_chipco_chipctl_maskset()
si_pmu_regcontrol() => bcma_chipco_regctl_maskset()
si_pmu_pllcontrol() => bcma_chipco_pll_maskset()
si_pmu_pllupd() => bcma_cc_set32()
si_pmu_alp_clock() => bcma_chipco_get_alp_clock()

This also removed the sih member from struct shared_phy.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>