Update tk1_mem.h from tillitis-key1

Synced at commit 5b49d80.

- Remove the UART config bitrate, data bits and stop bits. They are
  only configurable at build time.

- Deprecate *_SWITCH_APP, pending removal. New name is *_SYSTEM_MODE.

include/tkey/tk1_mem.h

@@ -83,9 +83,6 @@
 #define TK1_MMIO_UDS_LAST 0xc200005c
 
 #define TK1_MMIO_UART_BASE 0xc3000000
-#define TK1_MMIO_UART_BIT_RATE 0xc3000040
-#define TK1_MMIO_UART_DATA_BITS 0xc3000044
-#define TK1_MMIO_UART_STOP_BITS 0xc3000048
 #define TK1_MMIO_UART_RX_STATUS 0xc3000080
 #define TK1_MMIO_UART_RX_DATA 0xc3000084
 #define TK1_MMIO_UART_RX_BYTES 0xc3000088
@@ -106,7 +103,9 @@
 #define TK1_MMIO_TK1_NAME1 0xff000004
 #define TK1_MMIO_TK1_VERSION 0xff000008
 
+// Deprecated - use _SYSTEM_MODE_CTRL instead
 #define TK1_MMIO_TK1_SWITCH_APP 0xff000020
+#define TK1_MMIO_TK1_SYSTEM_MODE_CTRL 0xff000020
 
 #define TK1_MMIO_TK1_LED 0xff000024
 #define TK1_MMIO_TK1_LED_R_BIT 2