bootloader: fix section placement issues found by the check script

Summary of changes:

- bootloader_clock split into *_clock_init and *_clock_loader.
  Only esp_clk_apb_freq is in *_clock_loader.
- bootloader_common moved out of loader; functions needed in loader
  (or, referenced from bootloader_utility) were moved into
  bootloader_common_loader.c.
- assert and abort moved into bootloader_panic, made part of the
  loader
- rtc_clk and rtc_time made part of loader

components/bootloader_support/src/esp32/bootloader_esp32.c

@@ -351,18 +351,6 @@ static void bootloader_check_wdt_reset(void)
     wdt_reset_cpu0_info_enable();
 }
 
-void abort(void)
-{
-#if !CONFIG_ESP_SYSTEM_PANIC_SILENT_REBOOT
-    esp_rom_printf("abort() was called at PC 0x%08x\r\n", (intptr_t)__builtin_return_address(0) - 3);
-#endif
-    if (esp_cpu_in_ocd_debug_mode()) {
-        __asm__("break 0,0");
-    }
-    while (1) {
-    }
-}
-
 esp_err_t bootloader_init(void)
 {
     esp_err_t ret = ESP_OK;