RC: Add aom_ prefix to sb_params

To avoid symbol conflict when rolling into chrome

Bug: aomedia:450252793
Change-Id: I65d1024c2b01f2fd0a48e3dd717c3cb642c20aea

aom/aom_ext_ratectrl.h

diff --git a/aom/aom_ext_ratectrl.h b/aom/aom_ext_ratectrl.h
index 9b46354..e689473 100644
--- a/aom/aom_ext_ratectrl.h
+++ b/aom/aom_ext_ratectrl.h
@@ -140,10 +140,10 @@
 /*!\brief Superblock quantization parameters
  * Store the superblock quantiztaion parameters
  */
-typedef struct sb_parameters {
+typedef struct aom_sb_parameters {
   int q_index; /**< Quantizer step index [0..255]*/
   int rdmult;  /**< Superblock level Lagrangian multiplier*/
-} sb_params;
+} aom_sb_params;
 
 /*!\brief Encode frame decision made by the external rate control model
  *
@@ -158,7 +158,7 @@
    * It is zero initialized by default. It will be set for key and ARF frames
    * but not leaf frames.
    */
-  sb_params *sb_params_list;
+  aom_sb_params *sb_params_list;
 } aom_rc_encodeframe_decision_t;
 
 /*!\brief Information for the frame to be encoded.