submodules: delete CMSIS_5 from the repository

See https://github.com/raspberrypi/pico-setup/issues/57

Clones of debugprobe or invocations of pico-setup.sh frequently
encounter errors relating to bandwidth budgets. These sporadic errors
are due to the large size of the CMSIS_5 repo clone exhausting the
bandwidth quotas on Github, so drop this in favour of a downstream copy
of the relevant CMSIS-DAP firmware files.

Users are advised to delete and regenerate the build directory.

Optionally, reclaim filesystem space by removing .git/modules/CMSIS_5
and all subdirectories.

src/usb_descriptors.c

@@ -48,7 +48,7 @@ tusb_desc_device_t const desc_device =
 
     .idVendor           = 0x2E8A, // Pi
     .idProduct          = 0x000c, // CMSIS-DAP Debug Probe
-    .bcdDevice          = 0x0223, // Version 02.23
+    .bcdDevice          = 0x0222, // Version 02.22
     .iManufacturer      = 0x01,
     .iProduct           = 0x02,
     .iSerialNumber      = 0x03,