bootloader: shrink bin size

1. write a bootloader version of "getting chip revision" function.
2. reduce wordy log.

components/bootloader_support/include/bootloader_common.h

@@ -142,6 +142,13 @@ int bootloader_common_select_otadata(const esp_ota_select_entry_t *two_otadata,
  */
 esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t *partition, esp_app_desc_t *app_desc);
 
+/**
+ * @brief Get chip revision
+ *
+ * @return Chip revision number
+ */
+uint8_t bootloader_common_get_chip_revision(void);
+
 /**
  * @brief Check if the image (bootloader and application) has valid chip ID and revision
  *