msm: mdss: share mdss io utility APIs with other drivers

MDSS io utility contains APIs to handle driver specific
resources like GPIOs, power supplies, clocks and other
resources. Sharing them with other drivers allow them
to do resource management without re-writing the same
code.

Change-Id: Ib699407667239336cf82211e3f6e8eec97a104a8
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>