CLOCKSOURCE: mips-gic: Enable the clock before using it

CLOCKSOURCE: mips-gic: Enable the clock before using it

For the clock to be used (e.g. get its rate through clk_get_rate)
it should be prepared and enabled first.

Also, while the clock is enabled the driver must hold a reference to it,
so let's remove the call to clk_put.

Reviewed-by: Andrew Bresticker <[email protected]>
Signed-off-by: Ezequiel Garcia <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: James Hartley <[email protected]>
Cc: Govindraj Raja <[email protected]>
Cc: Damien Horsley <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/10779/
Signed-off-by: Ralf Baechle <[email protected]>