uio: pruss: use devm_clk_get() for clk init

uio: pruss: use devm_clk_get() for clk init

This change uses devm_clk_get() to obtain a reference to the clock. It has
the benefit that clk_put() is no longer required, and cleans up the exit &
error path.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20201119145059.48326-1-alexandru.ardelean@analog.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>