ipq806x: add enable reg and masks for PRNG

Cherry-picked from https://source.codeaurora.org/quic/qsdk/system/openwrt/tree/?h=korg/linux-3.4.y/release/arugula_bb_cs

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>

target/linux/ipq806x/patches-4.4/307-gcc-Added-the-enable-regs-and-mask-for-PRNG.patch

@@ -0,0 +1,25 @@
+From dd43e356db678a564ad2cc111962d72ba3162a38 Mon Sep 17 00:00:00 2001
+From: Abhishek Sahu <absahu@codeaurora.org>
+Date: Wed, 18 Nov 2015 12:38:56 +0530
+Subject: 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
+
+Change-Id: I89856c7e19e6639508e6a2774304583a3ec91172
+Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
+---
+ drivers/clk/qcom/gcc-ipq806x.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/clk/qcom/gcc-ipq806x.c
++++ b/drivers/clk/qcom/gcc-ipq806x.c
+@@ -1240,6 +1240,8 @@ 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,