Merge branch 'bugfix/btdm_isr_cache' into 'master'

component/bt : move some codes of controller to iram

1. mv codes which called by isr into iram
2. mv libcoexist.a into iram

See merge request !442

components/esp32/ld/esp32.common.ld

@@ -84,6 +84,7 @@ SECTIONS
     *librtc.a:(.literal .text .literal.* .text.*)
     *libpp.a:(.literal .text .literal.* .text.*)
     *libhal.a:(.literal .text .literal.* .text.*)
+    *libcoexist.a:(.literal .text .literal.* .text.*)
     _iram_text_end = ABSOLUTE(.);
   } > iram0_0_seg