drm/rockchip: vop: split out core clock enablement into separate functions

drm/rockchip: vop: split out core clock enablement into separate functions

commit e2810a7167df14c762e085fae5aade38425b71bf upstream.

Judging from the iommu code, both the hclk and aclk are necessary for
register access. Split them off into separate functions from the regular
vop enablement, so that we can use them elsewhere as well.

Fixes: d0b912bd4c23 ("iommu/rockchip: Request irqs in rk_iommu_probe()")
[prerequisite change for the actual fix]
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180612132028.27490-2-heiko@sntech.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>