drm/bridge: tc358767: Introduce tc_pllupdate()

tc_wait_pll_lock() is always called as a follow-up for updating
PLLUPDATE and PLLEN bit of a given PLL control register. To simplify
things, merge the two operation into a single helper function
tc_pllupdate() and convert the rest of the code to use it. No
functional change intended.

Signed-off-by: Andrey Smirnov <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Andrzej Hajda <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Andrey Gusakov <[email protected]>
Cc: Philipp Zabel <[email protected]>
Cc: Cory Tusar <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrzej Hajda <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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