configure: remove stray bfin architecture

This seems to have been omitted in
880e2aa23645ed9871c66ee1cbd00f93c72d2d73.

configure

@@ -2129,7 +2129,6 @@ AUTODETECT_LIBS="
 ARCH_LIST="
     aarch64
     arm
-    bfin
     ia64
     loongarch
     loongarch32
@@ -5336,10 +5335,6 @@ elif enabled arm; then
 
     test_cflags -mfp16-format=ieee && add_cflags -mfp16-format=ieee
 
-elif enabled bfin; then
-
-    cpuflags="-mcpu=$cpu"
-
 elif enabled loongarch; then
 
     enable local_aligned