Update SDK to 2.0.0

- Update SDK header files and libraries to SDK 2.0.0 plus 2.0.0_16_08_09
  patch
- Remove mem_manager.o from libmain.a (replaced with umm_malloc)
- Disable switch from DIO to QIO mode for certain flash chips (saves
  IRAM space)
- Add user_rf_cal_sector_set; it points to rf_init_data sector.
- Change the way rf_init_data is spoofed.
  This is now done by wrapping spi_flash_read and returning the data we
  need during startup sequence.
- Place lwip library into flash using linker script instead of section
  attributes (saves IRAM space)

tools/sdk/lwip/include/lwip/sntp.h

@@ -8,6 +8,8 @@
 extern "C" {
 #endif
 
+typedef long     time_t;
+
 /** The maximum number of SNTP servers that can be set */
 #ifndef SNTP_MAX_SERVERS
 #define SNTP_MAX_SERVERS           3
@@ -24,6 +26,8 @@ extern "C" {
 #define SNTP_SERVER_DNS            1
 #endif
 
+bool sntp_get_timetype(void);
+void sntp_set_receive_time_size(void);
 /** One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
  * #define SNTP_SERVER_ADDRESS "pool.ntp.org"
  */