ipq806x: gcc: Added the enable regs and mask for PRNG

Kernel got hanged while reading from /dev/hwrng at the
time of PRNG clock enable

Fixes: 24d8fba "clk: qcom: Add support for IPQ8064's global clock controller (GCC)"
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Link: https://lkml.kernel.org/r/20200318131657.345-1-ansuelsmth@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/qcom/gcc-ipq806x.c

@@ -1224,6 +1224,8 @@ static struct clk_rcg prng_src = {
 		.parent_map = gcc_pxo_pll8_map,
 	},
 	.clkr = {
+		.enable_reg = 0x2e80,
+		.enable_mask = BIT(11),
 		.hw.init = &(struct clk_init_data){
 			.name = "prng_src",
 			.parent_names = gcc_pxo_pll8,