[csrng/rtl] only two values for field enable

For a 4 bit field, only values of 0xa and 0x5 will take effect.
Added a recoverable alert signal for other field enable values, and a status register.

Signed-off-by: Mark Branstad <mark.branstad@wdc.com>
diff --git a/hw/ip/csrng/dv/env/csrng_env_pkg.sv b/hw/ip/csrng/dv/env/csrng_env_pkg.sv
index 6a65fdf..5ad90d4 100644
--- a/hw/ip/csrng/dv/env/csrng_env_pkg.sv
+++ b/hw/ip/csrng/dv/env/csrng_env_pkg.sv
@@ -22,8 +22,8 @@
 
   // parameters
   parameter uint     NUM_HW_APPS      = 2;
-  parameter string   LIST_OF_ALERTS[] = {"fatal_alert"};
-  parameter uint     NUM_ALERTS       = 1;
+  parameter string   LIST_OF_ALERTS[] = {"recov_alert","fatal_alert"};
+  parameter uint     NUM_ALERTS       = 2;
   parameter uint     KEY_LEN          = 256;
   parameter uint     BLOCK_LEN        = 128;
   parameter uint     CTR_LEN          = 32;