drm/i915: Fix wrong escape clock divisor init for GLK

According to Bspec clock divisor registers in GeminiLake
should be initialized by shifting 1(<<) to amount of correspondent
divisor. While i915 was writing all this time that value as is.

Surprisingly that it by accident worked, until we met some issues
with Microtech Etab.

v2: Added Fixes tag and cc
v3: Added stable to cc as well.

Signed-off-by: Stanislav Lisovskiy <[email protected]>
Reviewed-by: Vandita Kulkarni <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108826
Fixes: bcc657004841 ("drm/i915/glk: Program txesc clock divider for GLK")
Cc: Deepak M <[email protected]>
Cc: Madhav Chauhan <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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