Debugprobe release v2.2.2

Point release to address high uart TX baud rate corruption, at the
expense of throughput.

Also skip over an attempt at UART/SDK optimisation that caused issues
for users.

src/usb_descriptors.c

diff --git a/src/usb_descriptors.c b/src/usb_descriptors.c
index 04278c9..4039771 100644
--- a/src/usb_descriptors.c
+++ b/src/usb_descriptors.c
@@ -48,7 +48,7 @@
 
     .idVendor           = 0x2E8A, // Pi
     .idProduct          = 0x000c, // CMSIS-DAP Debug Probe
-    .bcdDevice          = 0x0221, // Version 02.21
+    .bcdDevice          = 0x0222, // Version 02.22
     .iManufacturer      = 0x01,
     .iProduct           = 0x02,
     .iSerialNumber      = 0x03,