esp32: Bootloader wake deep sleep stub

App can contain a stub program resident in RTC fast memory. Bootloader
will load the stub on initial boot. If the device wakes from deep sleep,
the stub is run immediately (before any other data is loaded, etc.)

To implement a custom wake stub, implement a function in your program:

```
void RTC_IRAM_ATTR esp_wake_deep_sleep(void)
{
  esp_default_wake_deep_sleep();
  // other wake logic
}
```

... and it will replace the default implementation.

components/esp32/ld/esp32.common.ld

@@ -102,7 +102,7 @@ SECTIONS
     _rodata_start = ABSOLUTE(.);
     *(.rodata)
     *(.rodata.*)
-	*(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
+    *(.irom1.text) /* catch stray ICACHE_RODATA_ATTR */
     *(.gnu.linkonce.r.*)
     *(.rodata1)
     __XT_EXCEPTION_TABLE_ = ABSOLUTE(.);
@@ -132,7 +132,7 @@ SECTIONS
     *(.dynamic)
     *(.gnu.version_d)
     _rodata_end = ABSOLUTE(.);
-	/* Literals are also RO data. */
+    /* Literals are also RO data. */
     _lit4_start = ABSOLUTE(.);
     *(*.lit4)
     *(.lit4.*)
@@ -153,4 +153,16 @@ SECTIONS
     _text_end = ABSOLUTE(.);
     _etext = .;
   } >iram0_2_seg
+
+  .rtc.text :
+  {
+    . = ALIGN(4);
+    *(.rtc.literal .rtc.text)
+  } >rtc_iram_seg
+
+  .rtc.data :
+  {
+    *(.rtc.data)
+    *(.rtc.rodata)
+  } > rtc_slow_seg
 }