clk: microchip: Initialize SOSC clock rate for PIC32MZDA.

Optional SOSC is an external fixed clock running at 32768HZ.
So Initialize SOSC rate as per PIC32MZDA datasheet.
Signed-off-by: NPurna Chandra Mandal <purna.mandal@microchip.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/microchip/clk-pic32mzda.c

@@ -118,6 +118,7 @@ static const struct pic32_sec_osc_data sosc_clk = {
 	.status_reg = 0x1d0,
 	.enable_mask = BIT(1),
 	.status_mask = BIT(4),
+	.fixed_rate = 32768,
 	.init_data = {
 		.name = "sosc_clk",
 		.parent_names = NULL,