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More headroom in fixed-point silk_burg_modified() to avoid an overflow

--- a/silk/fixed/burg_modified_FIX.c

+++ b/silk/fixed/burg_modified_FIX.c

@@ -37,7 +37,7 @@

 #define MAX_FRAME_SIZE              384             /* subfr_length * nb_subfr = ( 0.005 * 16000 + 16 ) * 4 = 384 */

 #define QA                          25

-#define N_BITS_HEAD_ROOM            2

+#define N_BITS_HEAD_ROOM            3

 #define MIN_RSHIFTS                 -16

 #define MAX_RSHIFTS                 (32 - QA)